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Metro > Ask Yourself > Flashcards

Ask Yourself Flashcards

1
Q

How will a driver identify a defective Compressor Governor?

A

• MR needle will fall below 580 kPa prior to compressors operating
• Compressors fail to cut out at 725 kPa

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2
Q

How can a driver isolate a defective Compressor Governor?

A

By tripping the compressor governor CB

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3
Q

What will the effect be of a tripped Compressor Governor Sync Circuit Breaker?

A

Compressors will operate independently, leading to inconsistent air supply and potential MR pressure fluctuations.

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4
Q

How will a driver identify the location of a loss of Main Reservoir pressure?

A

Monitor the Duplex Gauge:

Check for abnormal drops in Main Reservoir pressure (normal range: 585–725 kPa).

Perform a Full Cab Unattended Procedure:

Secure the train and de-activate the cab.

Inspect the Train:

Walk along the train, listening for air escaping from the Main Reservoir system.

Focus on areas near the Main Reservoir pipes, tanks, and connections.

Check the Compressor System:

Verify that compressors are running and not overloading.

Sectional Isolation:

Isolate sections of the train to pinpoint the source of the air leak

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5
Q

What steps does a driver take when the Main Reservoir pipe rupture is on the leading car and there is a competent employee available?

A

Secure the Train:
Apply the Emergency Brake and secure the train.
Notify Train Control to get competent Employee
Isolate the MR Pipe:
Close the Main Reservoir End Cock on the leading car while keeping the Brake Pipe End Cock open.

Ensure the Spring Park Brakes are released; manually release if necessary.

Charge the MR System:
Charge the train’s air system using compressors from trailing motor cars.

Relocate to Functional Cab:
Close the BVICS in the leading cab.

Perform Brake Test:
Conduct a continuity test to confirm proper brake operation in all cars except the isolated leading car.

Proceed at reduced speed, relying on the remaining braking systems.

Submit TMM

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6
Q

How will the train be removed from the section if no competent employee available?

A

• Isolate Faulty Equipment: Secure and isolate defective systems.
• Operate from Functional Cab: Move to a working cab if needed.
• Use Alternate Brakes: Rely on Automatic Air Brake or EP Brake.
• Proceed at Reduced Speed: Operate cautiously and notify Train Control.
• Submit a TMM: Log isolation details and actions taken

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7
Q

How does a driver operate the train when the No 1 Main Reservoir End Cock has been broken off?

A

By plugging the open pipe with a wooden plug.

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8
Q

What does a driver have to do if the Main Reservoir pipe rupture is under a Trailer car?

A
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9
Q

What does a driver have to do if the Main Reservoir pipe rupture is under any other motor car?

A
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10
Q

How does a driver rectify a ruptured Main Reservoir tank?

A

• Close MR Delivery IC
• Place Compressor Contactor ISO Switch to OFF
• Isolate Compressor Governor Circuit Breaker

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11
Q

What does a driver have to do if the Automatic Drain Valve has been damaged?

A

• Plug the pipe from the brake cylinder of number 1 bogie to the auto drain valve.
• Submit TMM to TC

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12
Q

What does a driver do if the flexible hose bursts between cars?

A

• Close the MR end cocks on both sides of affected hose
• Submit TMM to TC

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13
Q

What are the speed restrictions imposed if there is a deflated / isolated air bag?

A

Half the line speed for that section to a maximum of 30 km/h

Example: 80km = 30km/h
40 km/h = 20 km/h

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14
Q

What steps does a driver have to take when dealing with a rupture in the Control Reservoir system?

A

• The Control Reservoir must be isolated by turning the Control Reservoir IN isolating cock to ISOLATE
• The motor cut-out switch is to be turned to ALL OUT
• Submit TMM to TC

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15
Q

How does a driver try to rectify a whistle defect?

A

• Operate whistle lever rapidly
• Inspect whistle isolating cock (open and close rapidly)
• if not rectified whistle must be isolated

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16
Q

What can cause a Flashing Door Closed Light in a Comeng train?

CRAPDOTS

A

• Control Circuit breaker tripped in last motor
• Rear motor marker lights
• Aux circuit breaker tripped in last motor
• PLC isolated
• Doors failing to close
• Open circuit train cable
• Train coupler not registering
• Second BVICS open

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17
Q

How can a Comeng train obtain traction power with a continuously Flashing Door Closed Light?

A

Door Loop Bypass Key Switch

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18
Q

What must a driver do with any passengers when the Door Loop System is by-passed?

A

Detrain them

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19
Q

What is the maximum amount of saloon doors that can be isolated on each side of each car and still remain in revenue service?

A

1 per side per car

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20
Q

What can be the cause of all doors failing on one side of a carriage?

A

Electrical or Pneumatic

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21
Q

What can be the cause of all doors on a carriage being inoperative?

A

• Pneumatic ICs (Door Systems) or Electrical CBs

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22
Q

What can be the cause of all doors on the train failing?

A

• local remote-control circuits out of action
• Auxiliary control circuit breaker tripped

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23
Q

How can a driver manually release the saloon doors if they are locked shut?

A

Turn door isolating cocks to OFF position so self bleeder can remove air pressure

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24
Q

How are defective saloon doors secured on a Comeng train?

A

Temporary door locking device

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25
Q

How many Temporary Door Locking devices must a driver carry?

A

At least 1

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26
Q

Where can a driver locate replacement Temporary Door Locking devices?

A

TSO-PDS

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27
Q

What type of saloon lighting defects can occur on Comeng trains?

A

Mechanical, Electrical or Pneumatic

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28
Q

How does a driver try to rectify the whole train lighting being inoperative?

A

• Observe at-least 1 Panto is raised
• Check 110 v DC supply light
• Trip and reset Aux MCB
• press saloon button 3 times then press and hold for 5 seconds

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29
Q

How does a driver rectify half saloon lighting in one unit?

A

• Pressing the Traction Equipment Reset button
• Locally stopping and starting the inoperative MA

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30
Q

How does a driver rectify half saloon lighting in one car only?

A

• Press and hold the Saloon light ON button 3 times for 5 seconds
• reset Saloon Lighting MCB above Door 3 if required

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31
Q

How does a driver rectify the saloon lights being inoperative in one car in a regular sequence?

A

• examine lighting circuit breakers and isolation switches above door 3
• reset any tripped CBs
• ensure iso switches are in NORMAL position
• Press saloon lights ON button 3 times for 5 seconds

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32
Q

What operating restrictions are in place when all saloon lights including emergency are defective?

A

• Not to operate during hours of darkness
• Through the Murl

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33
Q

What type of communication methods can be used during electrically coupled train rescue?

A

110V DC Bell system

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34
Q

What must be checked prior to the coupling of the trains?

A

• Drivers must ensure the Park Brakes are applied in each cab.

• Inspect the general condition of the coupler.

• Ensure the Brake Pipe and Main Reservoir Pipe end cocks are open.

• Isolate the Electrical Coupling heads by turning the Yellow lever.

• If the disabled train’s pantographs are lowered, isolate the Yellow TECHAV cock on each cab to bypass primary and secondary safety devices

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35
Q

How is a Comeng pushing another Comeng performed?

A

After coupling, the driver of the disabled train:

• Releases Park Brakes.
• Walks to the leading cab for the direction of travel.
• Isolates the VICERS key switch and the EP Brake Circuit Breaker.

The driver of the assisting train:

• Isolates various systems, including the VICERS and Door Loop Bypass.
• Applies and isolates the Automatic Air Brake.
• Turns the Red EC cock and sets the Foot Pilot Valve.

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36
Q

How is a Comeng pulling another Comeng performed?

A

After coupling, the driver of the disabled train:

• Stays in the cab coupled to the assisting train.

• Isolates the VICERS key switch.

• Raises the Trip.

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37
Q

How is a Comeng pushing a Siemens performed?

A

The assisting Comeng inspects and couples the trains.

The Siemens driver:
• Puts the Brake Pipe Mode switch to “Pushed by Other Train.”
• Activates the Brake Pipe Mode key switch.
• Isolates the Traction Control Unit (TCU) MCB in all cabs.

A Continuity Test is performed, and communication is maintained

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38
Q

How is a Comeng pulling a Siemens performed?

A

The Siemens driver remains in the cab coupled to the assisting train and:

• Turns the Brake Pipe Mode switch to “Pulled by Other Train.”
• Activates the Brake Pipe Mode key switch.
• Isolates the Traction Control Unit (TCU) MCB in all cabs.

The Comeng driver prepares the leading cab, isolates systems, and conducts a Continuity Test.

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39
Q

How is a Comeng pushing an X’Trapolis performed?

A

The X’Trapolis driver:

• Applies Park Brakes.
• Turns the EMS to “Rescued.”
• Ensures the Brake Pipe Mode key switch is activated.

The Comeng driver:

• Prepares the cab coupled to the X’Trapolis.
• Ensures Train-lined Park Brakes are applied.
• Conducts a Continuity

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40
Q

How is a Comeng pulling an X’Trapolis performed

A

The X’Trapolis driver:

• Stays in the cab coupled to the assisting train.
• Activates the cab and sets the EMS to “Rescued.”
• Observes key fault and status lights.

The Comeng driver proceeds to the leading cab, prepares it, and performs a Continuity Test.

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41
Q

How is a Comeng pushing a Diesel hauled train performed?

A

The Diesel train’s coupler is equipped with a Transition Coupler.

The Diesel driver:

• Follows company-specific setup procedures.

The Comeng driver prepares the cab coupled to the Diesel train, isolates systems, and performs a Continuity Test.

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42
Q

How is a Comeng pulling a Diesel hauled train performed?

A

The Diesel train’s coupler is equipped with a Transition Coupler.

• The Comeng driver prepares the leading cab, isolates systems, and performs a Continuity Test.

• Both drivers ensure communication is maintained throughout the recovery process

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43
Q

What does an illuminated LOCAL fault light mean?

A

Indicates a traction equipment fault, such as traction overloads or other protective devices being tripped.

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44
Q

What can cause traction equipment faults?

A

Control reservoir faults: Low or insufficient compressed air (490 kPa +/- 20 kPa).

Pneumatic leaks: Affecting the control reservoir or related systems.

1500 V DC failure: A pantograph may not be in contact with the overhead wire.

Traction overloads tripping: Protective devices cutting power to prevent damage.

Circuit breaker failures: Disrupting power supply or causing train-lined faults.

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45
Q

What button is utilised to reset traction faults?

A

The Traction Overload Reset Button

The Master Controller must first be placed in the NEUTRAL position before pressing this button.

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46
Q

What are the positions of the Traction Cut out switch?

A

ALL IN (Normal): All traction motors active.

1 & 2 OUT: Isolates traction motors 1 and 2.

3 & 4 OUT: Isolates traction motors 3 and 4.

ALL OUT: Isolates all traction motors on that car

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47
Q

How are traction faults isolated?

A

• Place the Master Controller to OFF.
• Remove the controller key and unlock the Traction Cut-out switch.
• Set the Traction Cut-out switch to 1 & 2 OUT and press the Overload Reset Button to test the train.
• If the fault persists, set the switch to 3 & 4 OUT, press the reset button, and test again.
• If the fault is still present, set the switch to ALL OUT and press the reset button.
• After isolation, the Local, Line Switch, and This Car lights should extinguish.

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48
Q

What are the initial steps to take before the ROBBDS test?

A

Trips, Switches, Gauges and Cocks

Trip:
• Ensure the trip is lowered and reset.

Switches:
• Confirm switches are in their normal positions.
• Verify circuit breakers are in their normal positions.
• Ensure the “Doors Closed” button is activated (blue light steady).

Gauges:
• Check main reservoir, brake pipe, and control reservoir air pressures are within tolerances.

Cocks:
• Confirm the BVICS is open (if brake pipe pressure is low).
• Ensure the red emergency circuit cock and yellow TECH cock are in the normal position.

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49
Q

What does ROBBDS stand for?

A

• R: Reverser
• O: Traction Overload Reset
• B: Brake Pipe Reduction
• B: Control Governor Bypass
• D: Door Loop Bypass
• S: Second Master Controller

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50
Q

What steps does a driver take when the Main Reservoir pipe rupture is on the leading car and there is a competent employee is NOT available?

A

Train must be declared disabled

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51
Q

What are the 2 pressure settings of the compressor governor?

A

High: 725 kPa
Low: 585 kPa

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52
Q

What is the Main Res safety valve set to?

A

775 kPa

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53
Q

What is connected to the MR air system on a Comeng?

A
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54
Q

What is equipment connected to the Comeng 1500 v DC system?

A

• Pantographs
• Motor Alternators
• Compressors
• Traction Equipment

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55
Q

What are the steps to take when communication is available and a loss of overhead power occurs?

A

• Confirm the train has stopped safely.
• Contact the Train Controller.

• Check that the Loss of Overhead Shutdown Module (LSM) Power switch is ON.
• Lower all pantographs and confirm trailing pantographs are down.
• Press the Local MA EP Stop valve and Local Pantograph EP Stop valve as instructed.

Wait for the Train Controller to coordinate with Electrol for an overhead power reset.

56
Q

What are the steps to take when there is no communication and a suspected loss of overhead power has occurred?

A

• Perform a Risk Assessment of the area (check for overhead wire conditions, location, and train movements).

• Inspect Trip, Switches, Gauges, and Cocks to eliminate other faults.
• Check for the presence of 110 V DC power:
• Operational bell.
• Lowered Low Pressure (LP) flag.
• EP brake functionality.

If no 110 V DC power, check for 240 V AC power:
• Saloon and cab lights.
• Headlights.

If no power is present:

• Attempt a local Motor Alternator (MA) restart.
• Lower and raise the local pantograph and ensure good contact with the overhead wire.

57
Q

What is the purpose of the LSM?

A

• Reduce the risk of overloading substations when power is restored.

• Isolate defective circuits and high-power demand equipment during power loss.

• Automatically manage shutdowns based on the train’s speed, time, and BVICS status.

58
Q

What are the components of the LSM?

A

• Time Delay Relay:
Times shutdown actions over a 4-minute delay period.

• Speed Threshold:
Monitors train speed, set at 8 km/h, to trigger specific actions during power loss.

59
Q

How does the LSM affect the train when a loss of power occurs when the train is over 8 km/h?

A

If the train is moving above 8 km/h:

• The LSM does not trip circuits immediately.

• Automatic braking is not activated unless the train decelerates to below 8 km/h.

60
Q

How does the LSM affect the train when aloss of power occurs when the train is below 8 km/h?

A

If the train is moving under 8 km/h or stationary for less than 4 minutes:

• The LSM trips the EP circuit breaker, causing the LP flag to rise.

• All trailing pantographs are lowered, and trailing Motor Alternators are shut down.

• The train relies only on the Automatic Air Brake for stopping.

61
Q

How does the LSM affect the train when a loss of power occurs when the train is stationary and all BVICS have been closed in excess of 4 minutes?

A

If the train is stationary and BVICS are closed for over 4 minutes:

• The LSM activates fully:
• All pantographs are lowered.
• All Motor Alternators are shut down.
• The train cannot power until reset.

62
Q

What will happen to the VICeRs system after a loss of 1500 v DC power in excess of 5 minutes?

A

• The VICERS Activation Valve will open, exhausting Brake Pipe air to the atmosphere.

• Main Reservoir air will deplete as it tries to recharge the Brake Pipe.

• Once overhead power is restored, VICERS will reset automatically.

63
Q

What steps are to be taken to identify defective 1500 v DC equipment on a Comeng train?

A

Lower all pantographs.

• Raise each pantograph individually and start its Motor Alternator.
• Monitor for overhead power loss during these steps.
• If power is lost, isolate the defective pantograph and set the Motor Cut-Out switch to ALL OUT.

64
Q

What equipment can be affected by a weak substation?

A

• Traction
• Rheostatic brake performance.
• Air conditioners.
• Motor Alternators

65
Q

What notch of the Master Controller must be used when encountering a weak substation area?

A

Series

66
Q

What faults are indicated on the drivers fault panel?

LF, LS, MA, RB, AC, WS, PB, FP

A

Local Fault Light: Indicates a traction or rheostatic brake overload on a motor car.

Line Switch Fault Light: Indicates a line breaker failure on a motor car.

Motor Alternator (MA) Fault Light: Indicates a motor alternator is not running or producing output.

Rheostatic Brake Fault Light: Indicates a rheostatic brake setup failure.

Air Conditioner Fault Light: Illuminates or flashes for air conditioner failures.

Wheel Slip Indicator and Fault Light: Indicates wheel slip or a defective wheel slip unit.

Park Brake Light: Indicates one or more spring park brakes are applied.

Foot Pilot Valve Light: Indicates the status of the foot pilot valve.

67
Q

What defects can be caused by a Control Circuit Breaker tripping?

A

• Inability to remotely raise or lower pantographs.
• Inability to reset traction equipment overloads.
• Loss of traction power from the Master Controller.
• Failure of the rheostatic brake.
• Loss of functionality for the speedometer and Control Governor

68
Q

How does a driver rectify Control Circuit Breaker faults affecting the buttons?

A

• Reset the Control Circuit Breaker.
• Manually operate the pantographs using the local EP valves (for Raise or Lower).
• Electrically isolate the defective EP valve, if needed.
• Submit a Train Malfunction Message (TMM) to the Train Controller

69
Q

How does a driver rectify Control Circuit Breaker faults affecting the Brake Demand wire?

A

• Isolate the local rheostatic brake by switching it to ISOLATE.
• Reset the Control Circuit Breaker.
• If it stays set, proceed with the local rheostatic brake isolated.
• If it trips again, return the rheostatic brake to NORMAL and trip the EP circuit breaker.
• Operate the train using the automatic air brake.

Submit a TMM to the Train Controller.

70
Q

How does a driver deal with Ancillary Equipment faults?

A

• Identify affected circuit breakers (e.g., auxiliary control, EP brake, or compressor governor circuit breakers).

• Reset the circuit breaker if possible.

• Manually operate equipment if remote operation fails.

Submit a TMM if the fault persists

71
Q

How is a pantograph isolated?

A

• Press the Pantograph Lower EP valve to lower it.
• Isolate the Pantograph EP isolating cock.
• Toggle the Pantograph Electrical Switch to OFF.
• Set the Motor Cut-Out switch to ALL OUT for the affected car.
• Submit a TMM to the Train Controller.

72
Q

What can cause failures of a Motor Alternator?

A

• Electrical failure of the 1500 V DC supply.
• Air leaks in the Motor Alternator contactor system.
• Loss of main reservoir air supply.
• Overspeeding of the Motor Alternator.
• Isolation of the Pantograph or Motor Alternator systems.
• A lowered pantograph on the associated car.

73
Q

What happens when a Motor Alternator over speeds?

A

• It shuts down automatically.
• To reset, the Over Speed Trip must be manually reset (e.g., using a switch stick for General Electric models or a reset lug for Mitsubishi models).
• The train can still operate with one Motor Alternator running, although at reduced performance.

74
Q

How does a driver rectify a DC supply fault?

A

• Attempt to reset the DC Supply Circuit Breaker in the leading cab.
• If unsuccessful, reset a DC Supply Circuit Breaker in a trailing motor.

Submit a TMM to the Train Controller

• If no DC breakers can be reset, the train is disabled

75
Q

What type of communication methods can be used during non-electrically coupled train rescue?

A

• Whistle codes
• DTRS MCN call
• Any other safe form of communication

76
Q

What does an illuminated LINE SWITCH fault light mean?

A

Illuminates when a fault prevents the line breakers from closing on a motor car.

77
Q

With ROBBDS test, if you have checked Trip, Switches, Gauges and Cocks and don’t resolve the issue, what’s the next step?

A

Confirm that 110 V DC supply is available

78
Q

What are some ways you can confirm that you have 110 v DC?

A

• Checking if the DC Supply light is illuminated.

• Observing the “Doors Open” or “Doors Closed” light.

• Verifying the bell operates, the LP flag is lowered, and the EP brake is functional.

79
Q

How do you perform ROBBDS test in detail?

Go down each one

A

Reverser:

• Place the reverser into REVERSE and try for power.
• If the train powers in reverse but not forward, the reverser is defective in the forward direction.

Traction Overload Reset:

• Press the Traction Overload Reset Button.
• If power is restored, submit a Train Malfunction Message (TMM).

Brake Pipe Reduction:

• Reduce brake pipe pressure below 325 ± 20 kPa to open the Control Governor.
• Recharge to above 430 kPa to close the governor and try for power again.

Control Governor Bypass:

• Apply and isolate the brake, turn the red EC cock across the pipe, and press the Control Governor Bypass Button.
• If power is restored, the fault lies in the Control Governor.

Door Loop Bypass:

• Isolate the Door Loop Bypass key switch using the VICERS key.
• If power is restored, the fault lies in the traction inhibit system. Submit a TMM and de-train passengers.

Second Master Controller:

• Perform the full Cab Unattended Procedure and try for power using a second master controller.
• If power is restored, a Competent Employee must assist in clearing the section.
• If power is still unavailable, declare the train disabled.

80
Q

What are the causes of a loss of brake pipe pressure?

A

• Brake pipe flexible hose coupling uncoupling or rupturing.
• Activation of trip valves.
• Emergency cock in the van area being opened.
• Emergency application valve operation.
• Train dividing or derailing.
• VICERS system involuntary activation.
• Rupture of brake pipe or related piping.
• Main reservoir pipe or reservoir rupture.

81
Q

How is a brake pipe leak identified?

A

• Perform a Full Cab Unattended Procedure.
• Observe air pressure on the duplex gauge.
• Walk the train and listen for air escaping.
• Isolate the brake pipe in sections to locate the leak

82
Q

What steps are required to manage a ruptured flexible hose or brake pipe on a leading motor?

A

• Secure the train using EP brakes or the emergency brake.
• Identify the leak by listening for air escaping.
• Isolate the affected hose or pipe.
• Seal or plug the rupture where possible.
• Submit a TMM to the Train Controller.
• Proceed cautiously if the defect has been isolated.

83
Q

What steps are required to manage a ruptured flexible hose or brake pipe at an intermediate location?

A

• Secure the train using the EP brake.
• Isolate the defective car from the brake pipe system by closing the Brake Pipe End Cocks on either side of the defect.
• Submit a TMM and operate at reduced speed until repairs are complete.

84
Q

What steps are required to manage a ruptured flexible hose or brake pipe at an intermediate location?

A

• Secure the train using the EP brake.
• Isolate the defective car from the brake pipe system by closing the Brake Pipe End Cocks on either side of the defect.
• Submit a TMM and operate at reduced speed until repairs are complete.

85
Q

What is back tripping, and how is it rectified?

A

Back tripping occurs when a trip lever does not fully raise or vibrates into the lowered position, exhausting brake pipe air and applying the emergency brake.

To rectify:
• Identify the defective or lowered trip by visually inspecting the trip-striking lever or latching lever.
• Reset and raise the lowered trip.

86
Q

What steps are taken when a trip activates at a signal?

A

• Place the brake controller into Emergency.
• Attempt to reset the trip.
• If the trip is reset and the brake pipe recharges, follow applicable rules.
• If the brake pipe does not recharge, isolate the trip causing the issue

87
Q

What steps are taken when a trip activates for no apparent reason (e.g., debris)?

A

• Place the brake controller into Emergency.
• Assess the area for debris near the track.
• Reset the trip and proceed with Extreme Caution to the next fixed signal

88
Q

How is a defective trip isolated?

A

• Tie the defective trip lever in the raised position using rope from the train’s tool kit.
• Isolate the Yellow TECHAV Cock in the affected cab.
• Submit a TMM to the Train Controller.
• Proceed with Extreme Caution to the next fixed signal.

89
Q

What steps are taken to reset the VICERS system?

A

• Ensure the train is stationary.
• Place the Master Controller in “0” (coast).
• Set the brake controller to Emergency and wait for pressure to drop below 25 kPa.
• After 10 seconds, press the VICERS Acknowledgment Button.
• Return the brake controller to Run and Release to recharge the brake pipe.

90
Q

What procedures are followed when the VICERS system activates and cannot be reset?

A

• Isolate the VICERS Isolation Key Switch.
• Submit a TMM to the Train Controller.
• If the brake pipe continues to exhaust:
• Isolate the Red EC Cock.
• Apply the Automatic Air Brake.
• Press the Control Governor Bypass button as needed.

91
Q

What procedures are followed when the VICERS system activates and cannot be reset?

A

• Isolate the VICERS Isolation Key Switch.
• Submit a TMM to the Train Controller.
• If the brake pipe continues to exhaust:
• Isolate the Red EC Cock.
• Apply the Automatic Air Brake.
• Press the Control Governor Bypass button as needed.

92
Q

How is the location of a brake pipe leak determined?

A

• Secure the train using the EP brake.
• Isolate the brake pipe in sections (e.g., trailing or leading units).
• Open the BVICS to check if the brake pipe charges.
• Walk the train, listening for air escaping to pinpoint the leak.

93
Q

How is a defective charging valve identified?

A

• The brake pipe does not charge when the BVICS is open, and the brake controller is in the RELEASE position.
• No air sound is heard passing through the brake controller.

94
Q

What steps are taken to rectify a defective charging valve?

A

• Ensure the main reservoir to brake controller isolating cock is open.
• Move the brake controller between RELEASE and EMERGENCY to free the valve.
• If unresolved, charge the brake pipe from a trailing motor and operate at restricted speed

95
Q

What is the function of the Lockout Magnet Valve?

A

It prevents the Automatic Air Brake from working when the EP Brake or Rheostatic Brake is in use, ensuring only one braking system is active.

96
Q

What is the function of the Lockout Magnet Valve?

A

It prevents the Automatic Air Brake from working when the EP Brake or Rheostatic Brake is in use, ensuring only one braking system is active.

97
Q

What are the symptoms of a defective Lockout Magnet Valve?

A

Closed Position: No automatic air brake in the SERVICE zone.

Open Position: Automatic air brake works simultaneously with EP/Rheostatic brake

98
Q

How is a defective Lockout Magnet Valve rectified?

A

Closed Position: Use the EMERGENCY position to apply the brakes.

Open Position: Trip the EP Brake circuit breaker and use the automatic air brake

99
Q

What is the function of the Emergency Application Valve?

A

It releases brake pipe air to the atmosphere during an emergency brake application, ensuring the brakes engage immediately.

100
Q

How is a defective Emergency Application Valve identified?

A

• Emergency brakes do not release.
• The control governor remains open.
• Loss of control voltage to the master controller

101
Q

How is a defective Emergency Application Valve rectified?

A

• Ensure the Trip and Foot Pilot Valve are in the correct positions.
• If unresolved, declare the train disabled

102
Q

What is the function of the Release Prevention Valve?

A

• It stops the brakes from releasing when the brake pipe pressure is too low until the auxiliary reservoir pressure drops enough

103
Q

What are the indications of a defective Regulating Valve?

A

• Brake pipe pressure is outside the normal range (425–550 kPa).
• Erratic movement of the brake controller handle.

104
Q

How is a defective Regulating Valve rectified?

A

• Adjust or replace the regulating valve.
• Operate the train cautiously if unresolved.

105
Q

What are the symptoms of a defective brake controller handle?

A

The handle moves on its own, either toward RELEASE or SERVICE positions.

106
Q

What steps are taken to manage a defective brake controller handle?

A

• Use a secondary brake controller from another cab if necessary.
• Submit a TMM for further investigation

107
Q

What is the purpose of the Train-lined Spring Park Brake?

A

It secures the train mechanically during a loss of main reservoir pressure.

108
Q

What are the symptoms of a Train-lined Spring Park Brake not releasing?

A

• The Park Brake Light remains illuminated.
• Brakes fail to release even after the circuit breaker is reset

109
Q

What steps are taken to rectify a Train-lined Spring Park Brake not releasing?

A

• Check the train-lined park brake isolating cock.
• Reset the park brake circuit breaker

110
Q

What is the procedure for a compressor governor circuit breaker tripping?

A

• Check for air leaks or faults in the compressor system.
• Reset the circuit breaker

111
Q

What is the procedure if the brake pipe fails to charge?

A

• Ensure the BVICS is open and the brake controller handle is in RELEASE.
• Check the main reservoir to brake controller isolating cock

112
Q

What speed restrictions apply when operating with a defective charging valve?

A

• Operate at a maximum speed of 15 km/h if the brake pipe is charged from a trailing motor.

113
Q

What can cause erratic brake cylinder pressure while operating on the EP Brake?

A

• Defective train cable.
• Faulty brake controller.
• Malfunctioning code conversion unit.
• Mechanical issues with brake rigging.

114
Q

How does a driver deal with ineffective Rheostatic brake performance?

A

• Use the automatic air brake for the remainder of the journey.
• Submit a Train Malfunction Message (TMM) to Train Control

115
Q

How does a driver deal with ineffective EP Brake performance?

A

• Isolate the EP Brake system.
• Operate the train using the automatic air brake.
• Submit a TMM to Train Control

116
Q

What are the symptoms of a defective brake unit on a car?

A

• The train fails to stop as expected.
• Brake cylinder pressure shows 0 kPa.
• Brakes do not apply during a continuity test

117
Q

How does a driver deal with ineffective Automatic Air Brake performance?

A

• Inspect the train for faults in brake cylinders, rigging, or auxiliary reservoirs.
• Operate using the EP or Rheostatic Brake if available.
• Submit a TMM to Train Control

118
Q

How does a driver identify brake rigging defects?

A

• Inspect the brake rigging using a Tri-key.
• Look for fouling or physical damage.
• Tie up defective rigging and isolate the affected bogie.

119
Q

What are the causes of a loss of brake pipe pressure?

A

• Brake pipe flexible hose coupling uncoupling or rupturing.
• Activation of trip valves.
• Opening of the emergency cock in the van area.
• Emergency application valve operation.
• Train dividing or derailing.
• VICERS system involuntary activation.
• Rupture of brake pipe or related piping.
• Main reservoir pipe or reservoir rupture.

120
Q

How is a brake pipe leak identified?

A

• Perform a Full Cab Unattended Procedure.
• Observe air pressure on the duplex gauge.
• Walk the train, listening for air escaping.
• Isolate the brake pipe in sections to locate the leak

121
Q

What steps are required to manage a ruptured flexible hose or brake pipe on a leading motor?

A

• Secure the train using EP brakes or the emergency brake.
• Identify the leak by listening for escaping air.
• Isolate the affected hose or pipe.
• Seal or plug the rupture where possible.
• Submit a TMM to Train Control.
• Proceed cautiously if the defect has been isolated.

122
Q

What steps are required to manage a ruptured flexible hose or brake pipe at an intermediate location?

A

• Secure the train using the EP brake.
• Isolate the defective car by closing the Brake Pipe End Cocks on either side of the fault.
• Submit a TMM and operate at reduced speed until repairs are complete.

123
Q

What is back tripping, and how is it rectified?

A

• Back Tripping occurs when a trip lever does not fully raise or vibrates back into the lowered position, exhausting brake pipe air.

To rectify:

• Identify the defective or lowered trip.
• Reset and raise the trip lever manually.

124
Q

What steps are taken when a trip activates at a signal?

A

• Place the brake controller into EMERGENCY.
• Attempt to reset the trip.
• If the trip is reset and the brake pipe recharges, follow applicable rules.
• If the brake pipe does not recharge, identify and isolate the defective trip

125
Q

What steps are taken when a trip activates for no apparent reason (e.g., debris)?

A

• Place the brake controller into EMERGENCY.
• Inspect the area for debris near the track.
•Reset the trip and proceed with Extreme Caution to the next fixed signal.

126
Q

How is a defective trip isolated?

A

• Tie the defective trip lever in the raised position using rope or a suitable tool.
• Isolate the Yellow TECHAV Cock in the affected cab.
• Submit a TMM to Train Control.
• Proceed with Extreme Caution to the next fixed signal.

127
Q

What steps are taken to reset the VICERS system?

A

Ensure the train is stationary.
• Place the Master Controller in “0” (coast).
• Set the brake controller to EMERGENCY and wait for pressure to drop below 25 kPa.
• After 10 seconds, press the VICERS Acknowledgment Button.
• Return the brake controller to Run and Release to recharge the brake pipe.

128
Q

What procedures are followed when the VICERS system activates and cannot be reset?

A

• Isolate the VICERS Isolation Key Switch.
• Submit a TMM to Train Control.
• If the brake pipe continues to exhaust:
• Isolate the Red EC Cock.
• Apply the Automatic Air Brake.
• Use the Control Governor Bypass Button as needed

129
Q

How is the location of a brake pipe leak determined?

A

• Secure the train using the EP brake.
• Isolate sections of the train by closing Brake Pipe End Cocks systematically.
• Open the BVICS to test for recharging.
• Walk the train and listen for escaping air to pinpoint the leak.

130
Q

What are the indicators of sticking brakes?

A

• Smoke or odor from overheated components.
• Retardation of the train.
• Illuminated fault lights.
• Hot or discolored wheels.

131
Q

What is the function of a Dump Valve?

A

Reduces auxiliary reservoir pressure during emergency brake applications, allowing the brakes to release when the brake pipe is recharged.

132
Q

How does a driver rectify sticking brakes in running?

A

• Trip the EP Brake Circuit Breaker and apply/release the brake.
• Monitor the train for signs of smoke, odor, or retardation.

133
Q

How does a driver rectify sticking brakes when stationary?

A

Perform rapid brake applications and releases.
• Inspect the train for smoke, heat, or mechanical issues.
• Isolate the affected bogie if necessary.

134
Q

What does the Panto Isolation Switch isolate?

A

The Panto Isolation Switch isolates the electric control circuit for the pantograph.

135
Q

What does the Panto Isolation Switch cut off?

A

It cuts off the control voltage needed to raise or operate the pantograph.

136
Q

Does the Panto Isolation Switch affect the pneumatic system?

A

No, it does not directly affect the pneumatic system.

Metro (23 decks)

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