Comeng - Sticking Brakes, Skidding Wheels Flashcards
What are the 3 dangers with skidding wheels?
Risk of track damage
High possibility of derailment if lead wheels
Damage to wheels
What 3 actions can cause skidding wheels?
Heavy brake applications
Sticking brakes
Mechanical failure
When coasting in a motor or trailer car, what fault light can indicate skidding wheels?
Steady wheel slip
When powering, in a motor car what fault lights indicate wheel slip on a motor car?
Flashing line switch and local
Steady wheel slip
When Rheo braking, what fault lights could indicate skidding wheels?
Steady wheel slip and this car
Why are skidding wheels not obvious to a driver?
Retardation on the train is negligible
Smoke or smell less obvious
Sounds may not be apparent
How would a driver confirm skidding wheels?
Mark the suspected wheel with ballast and move forward checking for rotation
Driving forward with a competent employee looking
What is the speed limit for skidding wheels when clearing the section?
5km/h
Can a train with skidding wheels on the lead motor be driven forward?
No as you could derail
Where should a driver take extreme care over when dragging skidding wheels to clear the section?
Guard rails, cross overs, facing points
Can a driver setback with trailing skidding wheels?
No only forward
Who will protect the line after a train has cleared the section with skidding wheels?
Flag signallers
Who inspects the track after a train with skidding wheels has cleared the section and what must they do?
Infrastructure personnel who will
Examine the line and either stop or advise all trains behind to travel at a reduced speed
If the track can’t be inspected, what speed will track force protection instruct drivers to travel over the affected piece of track?
15km/h
What indicators would you get for sticking brakes?
Retardation of train
Smoke
Observation of brake cylinders
Fault lights
What does the dump valve release pressure from to apply an emergency or full service brake?
Auxiliary res
What pressure does the dump valve reduce for a brake application?
415kpa for a Knorr
425KPA for a westcode
In running, what is the procedure to release a sticking brake?
Check there are relevant pressures and no audible flow from charging valve
Trip EP circuit breaker and make full service application and release
Check for smoke or retardation
If rectified book as rectified in running and if not stop and commence fault finding in stationary
What is the procedure for sticking brakes when stationary?
Ensure pressures are correct
Perform rapid succession of EP from step 7 to run and release
Apply minimum power and coast to feel for retardation
If rectified book as rectified in running
If stationary procedure for sticking brakes doesn’t work, what is the next step?
Lodge a tech call
Make PA and obtain reactive track access
Full cab unattended
Inspect brakes and wheels for excessive smoke or heat
When found determine if it is park brake wheel or entire bogie
If bogie isolate it
If brakes don’t come off or bogie isolate continues to vent isolate and manually release spring park brake
Book as per FMP
What is the speed restrictions for up to 2 bogies isolated on a 6 car or 1 on a 3 car?
No speed restrictions up to 60km/h then 10 below track speed
Are trains with sticking brakes permitted to enter the loop?
No unless faults have been rectified or isolated
If already in the loop and sticking brakes has occurred, what should the driver do?
TEC call
Train control will stop all trains from entering the loop
Driver stops short of platform and tries to identify and isolate the fault
If fault in the loop cannot be rectified but train can be moved, what is the procedure?
Inform TC
Move to platform at extreme caution
Passengers de trained at platform
Wait for fleet maintenance to arrive
If fault in the loop cannot be rectified but train cant be moved, what is the procedure?
TEC call
De train passengers when safe to do so
Remain stationary until fleet arrives
If SPB won’t release what is the procedure?
Check main res pressure
Ensure circuit breakers are set
Check position of reverser
Press train lined SPB 3 times and hold for 5 seconds
If this fails go and manually release them all
