Multiple Unit Locomotives And MU Trains Flashcards
Battery voltage is train lined on all MU trains for what 5 items?
How is this accomplished on M3 and M7’s?
1) Propulsion Commands. 2)Braking Commands
3) Door Operations. 4)Trainline Indicators
5) Communication
M3=Through couplers on F end and 8 cables between married pairs on B end
M7=Through couplers on F end and 14 cables between married pairs on B end
Is high voltage electricity train lined on MU trains?
No. High voltage is present between and below cars of married pairs
What electrical power is train lined on MU trains?
Low voltage battery power
How many jumper cables between married pairs of cars carry high voltage? M3? M7?
M3- 2 located at the B end, between married pairs,south side,outside
M7- 5 located at the B end, between married pairs,near the middle
The inverter is located on which car of a married pair(M3)?
The A car
Locate the auxiliary inverter(high voltage indicator lights) on M7 equipment.
A and B car
Cab side
Approximately middle of car
Ground level
Explain the procedure to perform a DC link discharge procedure on M7 equipment.
1) Master controller in emergency
2) Ensure HV LED Indicator lights on Aux. Inverter are illuminated
3) Request removal of 3rd rail power
4) When 3rd rail is comfirmed de-energized crew member will observe HV indicator lights until extinguished.
5) When extinguished DC link is de-energized
Is Main Reservoir air pressure train lined on M3/M7 trains?
No
Name the air pressure that is train lined on M3/M7 trains?
Brake pipe
What is standard BP and Main Reservoir pressure on M3/ M7 trains?
M3= 130-150
M7= 120-150
True or false? Brake pipe controls service and emergency on MU trains?
False
P wire for service braking and brake pipe for emergency
How are M3 and M7 cars numbered?
M3=9771 - 9946
M7=7001-7836
1) What is the M3 F end coupler known as?
2) Suspended below the mechanical portion of this coupler is the electric portion that train lines low voltage and is known as_____
3) What two items are necessary when rescue is required by another type of locomotive?
1) N2A coupler
2) FL38
3) Assist Hose and End Cock
1) The M7 mechanical coupler is known as?
2) Suspended below the mechanical portion of the coupler is the electric portion that train lines low voltage and is known as_____
3) The Drum Switch controls flow of low voltage through the BBM 122 and has 2 positions known as ____ and ____ .
1) N6 coupler
2) BBM122
3) Isolate and Through
1) The M7 has a brake pipe assist hose and what item that replaces the Brake Pipe End Cock?
2) What are the 3 positions of this piece of equipment?
1) Three Way Valve
2) Normal-Brake pipe flow through tappet valve
Loco Haul-Brake pipe flow through Assist Hose
Reset-introduce compressed air to reset manually released parking
brake
What is needed to connect a M3 to M7 for rescue purposes?
Compromise Coupler
What device on an M7 controls the flow of brake pipe through the Assist Hose?
3 Way Valve
Explain the proper positioning of the Drum Switch within an M7 consist?
East an west end of consist= Isolate
Coupled F end cars in consist= Through
Where are the ASC seals located on MU equipment?
M3-B car only,cab side,in the crew locker,just past the
bathroom
M7-B car only (ATC+SSS), in the lower portion of locker, just opposite
the engineers cab
What should be sealed in the operating pair on an M3?
ATC Snow Brake Door Bypass
What should be sealed in the operating pair of an M7?
ATC SSS ALE
Snow Brake Bypass Door Bypass Screen Selector
Name the indicators in the engineers cab that can be used to read trainline conditions on MU’s?
Brake pipe pressure gauge( only after a proper brake test )
Brake application light
Brake release light
Door closed light
**M7’s only parking brake indicator on TOD display
What does a lit brake application light on a charged train indicate to the engineer?
That all air brakes are applied
What does a lit brake release light on a charged train indicate to the engineer?
That all air and hand brakes on the train are released
During normal operations what does a lit door light on the master controller console indicate to the engineer(M3)?
That the train is charged
And that all doors on the train are closed
Which 2 indicating lights in the operating cab must be illuminated for the train to take power?
Door closed light
Brake release light
From top to bottom identify the 3 local indicating lights above the engineers cab door on M3 cars ( interior )
Green = local brake release light
Amber= local brake applied light
Red = local handbrake applied light
Name the F end exterior local indicator lights(M3’s) and what they indicate when lit?
Blue= ATC operative
White= door station energized
Green= local air brake release light
Amber= local air brake application
Red= local handbrake applied
Name the F end exterior lights on M7’s and what they indicate when lit?
Green= local air brakes released
Amber= local air brakes applied
White= door station energized
Red= (flashing) local handbrake applied
Blue= ATC operative
Name the M7 exterior door lights and what do they indicate?
Red=door open
Amber=door disabled when flashing
Red= door closing when flashing
When should door bypass be used?
1) Train doors are confirmed closed
2) Door control and Motor circuit breakers are properly positioned
3) Engineer is still unable to obtain a trainline Door Closed light
After checking doors and circuit breakers is it required to get permission before going to Door Bypass?
Crew must receive permission from 204 or transportation supervision before going to Door Bypass
If unable to get permission to go to door bypass due to communication issues how may the train proceed?
Go to Door Bypass, operate according to the rules, informing 204 as soon as possible when communication is re-established.
What does the use of Door Bypass provide?
A false Door Closed light permitting a train to draw power
Name two functions of the Door Hold Closed switch?
1) Removes operational control of the doors from the control panels
2) Cancels multiple energized door stations
When should PKO Bypass be used?
When a trains air and hand brakes are confirmed released by crew inspection and is still unable to obtain a brake release light
1) After the crew has determined that all air and hand brakes are released is it necessary to obtain permission to use PKO Bypass?
2) While operating in PKO Bypass what must the crew be observant of?
1) The crew must get permission of 204 or Transportation Supervision before going to PKO Bypass
2) The crew must observe train for smoke conditions
If unable to get permission due to communication issues crew may use PKO Bypass and operate according to the rules and inform 204 or Transportation Supervision as soon as possible when communication is re-established. True or false?
True
What does the use of PKO Bypass(power knock out) provide?
Provides a false brake release light permitting a train to draw power
The Duplex Air Pressure gauge located in the engineers cab monitors 2 pressures. Name them?
Brake pipe=White
Brake cylinder=Red
What should the air pressures on the duplex air pressure gauge read on a fully charged brake pipe with master controller in max brake on M3 and M7 ?
M3
Brake pipe= 130-150 psi
Brake cyl = 70+ psi
M7
Brake pipe= 120-150 psi
Brake cyl = 38+psi
What is the buzzer sequence to perform a class 2 brake test on M3 equipment?
OOOO
OOOO
O
______
______ response
What is the buzzer sequence to perform a class 2 brake test on M7 equipment?
OOOO
O
OOOO
O
______
______ response
What is observed at each step of a class 2 brake test on M3 equipment?
OOOO engr release then apply brakes to test p wire train line
OOOO engr release brakes then test deadman to test for train lined brake pipe
O engr recharge brake pipe and release the air brake
______ brakes have applied and released on rear car and are operative
______ engr acknowledges
What is observed at each step of class 2 brake test on an M7?
OOOO engr pull the emergency brake valve handle to test train lined brake pipe
O engr reset the EBVH, recharge brake pipe then release and apply the air brake to test p wire train lined
OOOO engr move the master controller to emergency to test train lined EMV
O engr recharge brake pipe then release and apply the air brake to test p wire train lined
______ brakes have applied and released on rear car and are operative
______ engr acknowledges
With the master controller in coast on a charged train the engr does not have a release light. What does this indicate?
This condition indicates a local brake pipe problem.
At least one air or hand brake applied in the consist
With the master controller handle in the coast position on a charged train the engr has a continuous brake application light. What does this condition indicate?
This condition indicates that all air brakes on the train are applied. And is a trainline condition(potential p wire problem)
Identify the two methods for releasing stuck air brakes locally on a M3. Which is preferred and why?
EP cutout (electro pneumatic) 1 per car Truck cutout (truck isolation) 2 per car
EP cutout is preferred because it releases service brake only, while retaining emergency brake function of that car
Locate the truck cutout cocks on an M3 car?
2 truck cutouts per car
F end cutout-engrs cab side directly ahead of R1 and R2 doors
under the seat, inside and outside
B end cutout-off cab side directly to rear of L3 and L4 doors
under the seat, inside and outside
Locate the EP cutout cock on an M3 car?
There is 1 EP cutout per car
Off cab side, middle of car,
under back to back to back seats,
accessible form both inside and outside
Name the two methods for releasing air brake locally on an M7 car. Which is preferred and why?
SBCO-(service brake cutout) releases service braking only
BCCO-(brake cylinder cut out) releases service and emergency
braking
SBCO is preferred because you will retain emergency brake function of that truck
Locate the SBCO and BCCO on M7 equipment
2 SBCO’s and BCCO’s per car
Locate the EMV exhaust on an M3 pair of cars.
A car only
Off cab side
Middle of car
Outside of car
What 2 functions of the master controller are nullified with a plugged EMV in the operating pair of an M3 train?
Deadman and emergency
Would deadman protection need to be provided if the EMV was plugged in the middle of an 8 car M3 consist? Explain.
No
EMV’s are not train lined on M3’s
Locate the EMV on an M7 pair of cars
Both A and B car
Inside only
Behind the L1 door
Floor level
Are EMV’s train lined on M7’s?
Yes
Describe how a closed brake pipe cutout in the middle of a MU consist would affect the brakes on a train.
Service braking unchanged since it is p wire controlled
Emergency brake application by EBVH on all MU’s
Or an M3 master controller
Would propagate an emergency brake application
Up to the closed valve
Emergency brake application by master controller on M7
Would function normally provided at least 1 EMV
Is cut in on both sides of the closed Brake pipe cutout
