Comeng - Loss Of Brake Effectiveness or BP Pressure

Question 1

How would you isolate the Rheo brake?

Answer 1

Trip the EP circuit breaker, run on the air

Question 2

What reasons could an EP brake be ineffective?

Answer 2

Electrical wires connecting to 7 step are dissaranged
Defective Brake unit
Defective brake controller
Mechanical breakdown of rigging

Question 3

If you suspect a defective train cable, what is your only option?

Answer 3

Trip the circuit breaker

Run on the air

Question 4

What signs will you get for a defective brake unit?

Answer 4

Ineffective braking
Brake cylinder pressure displaying 0
Brakes don’t apply while performing continuity test

Question 5

Name some forms of Automatic Air Brake?

Answer 5

Emergency Tap, Accidental Breakaway, Safety apparatus or ep circuit breaker

Question 6

What three things need to be considered regarding an automatic air brake fault?

Answer 6

Can the train continue
Does it need to be shunted
Can it be safely moved at all

Question 7

When would a bogie need to be isolated in relation to the air brake?

Answer 7

Defective brake unit

Ruptured hose coupling to the bogie air brake system

Question 8

If 50%-80% bogies have been isolated, what speed would be shunt into a siding?

Answer 8

Extreme caution

Question 9

If more then 50% of bogies have been isolated, what’s the speed restriction?

Answer 9

Train disabled

Question 10

If the air brake is performing below standard, what is the visual checks needed to be made?

Answer 10

Checking brake cylinder gauges and rigging

Question 11

If the automatic air brake has not applied to the car , what isolating cock checks need to be carried out?

Answer 11

Main res to 7 step
Brake pipe to triple valve
Bogie isolating cocks

Question 12

If all cocks are open, what should the driver inspect next?

Answer 12

Superficial examination of piping to brake cylinders, brake unit and aux res

On motor cars pipe between brake cylinders and bogie 1 and main res drain valve inspected and repaired if possible

Question 13

What indications may you get for a loss of brake pipe pressure?

Answer 13

Sound of charging valve and relay valve at the same time
Brake pipe and main res gauges are falling
Emergency brake applying

Question 14

What is the first thing that needs to be done when we see the brake pipe pressure dropping?

Answer 14

Put the brake handle into emergency to try and reset the trip

Question 15

If you suspect you have back tripped, what should you do?

Answer 15

Reset the trip from the lead cab

If it works contact TC and ask for a reactive track access to raise or isolate

Question 16

True or false, With a competent employee assisting, the EP circuit breaker always tripped to run on the air when dealing with a ruptured brake pipe?

Answer 16

True

Question 17

In what two scenarios is a competent employee not required with a ruptured brake pipe?

Answer 17

A rupture in the trailing centre and trailer car on the rear 3 car set

Question 18

When travelling with brake pipe faults, what is the speed?

Answer 18

15km/h

Question 19

With a ruptured brake pipe, in what cars is a competent employee a necessity?

Answer 19

All except car 4 and 5 (trailing centre and trailer on the trailing 3 car set)

Question 20

If we are back tripping due to a defective trip, what do we isolate?

Answer 20

Yellow TEC

Question 21

What is the procedure when there is a brake pipe rupture in the lead motor?

Answer 21

Lead motor
CE in front to look for signals and use spb in emergency
Isolate brake pipe end cocks
Pull hand release wire to release air brake

Driving Motor
Turn red ec
Trip EP circuit breaker
Driver to drive from longest brake pipe portion
Competent employee in the front looking for signals
Speed is 15

Question 21

What is the procedure for a brake pipe leak on car 6?

Answer 21

Isolate brake pipe end cocks
Pull hand release wire to release air brake
Trip EP circuit breaker
Driver to drive from longest brake pipe portion
Competent employee in the back in case of break away
Speed is 15

Question 22

What is the procedure for a brake pipe defect in cars 4 and 5 with a competent employee?

Answer 22

Isolate brake pipe end cocks
Pull hand release wire to release air brake
Trip EP circuit breaker
Driver to drive from longest brake pipe portion
Competent employee in the rear to keep brake pipe on trailing motor charged in case of breakaway
Speed is 15

Question 23

What is the procedure if a competent employee is not available for a brake pipe rupture in cars 4 and 5?

Answer 23

In defective motor:
Isolate brake pipe end cocks
Pull hand release wire to release air brake
Isolate main res to 7 step
Open BVIC on trailing motor and leave handle in run and release

In driving motor:
Run on EP at no faster then 15

Question 24

What is the procedure for a ruptured brake pipe in cars two or 3?

Answer 24

Lead motor
CE in front, trip lowered

Defective motor
Hand release wire pulled
End cocks closed

Driving motor
Red ec turned
Ep circuit breaker tripped 
Isolate vicers 
Speed 15