Comeng - Loss Of Brake Effectiveness or BP Pressure Flashcards
How would you isolate the Rheo brake?
Trip the EP circuit breaker, run on the air
What reasons could an EP brake be ineffective?
Electrical wires connecting to 7 step are dissaranged
Defective Brake unit
Defective brake controller
Mechanical breakdown of rigging
If you suspect a defective train cable, what is your only option?
Trip the circuit breaker
Run on the air
What signs will you get for a defective brake unit?
Ineffective braking
Brake cylinder pressure displaying 0
Brakes don’t apply while performing continuity test
Name some forms of Automatic Air Brake?
Emergency Tap, Accidental Breakaway, Safety apparatus or ep circuit breaker
What three things need to be considered regarding an automatic air brake fault?
Can the train continue
Does it need to be shunted
Can it be safely moved at all
When would a bogie need to be isolated in relation to the air brake?
Defective brake unit
Ruptured hose coupling to the bogie air brake system
If 50%-80% bogies have been isolated, what speed would be shunt into a siding?
Extreme caution
If more then 50% of bogies have been isolated, what’s the speed restriction?
Train disabled
If the air brake is performing below standard, what is the visual checks needed to be made?
Checking brake cylinder gauges and rigging
If the automatic air brake has not applied to the car , what isolating cock checks need to be carried out?
Main res to 7 step
Brake pipe to triple valve
Bogie isolating cocks
If all cocks are open, what should the driver inspect next?
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
What indications may you get for a loss of brake pipe pressure?
Sound of charging valve and relay valve at the same time
Brake pipe and main res gauges are falling
Emergency brake applying
What is the first thing that needs to be done when we see the brake pipe pressure dropping?
Put the brake handle into emergency to try and reset the trip
If you suspect you have back tripped, what should you do?
Reset the trip from the lead cab
If it works contact TC and ask for a reactive track access to raise or isolate
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?
True
In what two scenarios is a competent employee not required with a ruptured brake pipe?
A rupture in the trailing centre and trailer car on the rear 3 car set
When travelling with brake pipe faults, what is the speed?
15km/h
With a ruptured brake pipe, in what cars is a competent employee a necessity?
All except car 4 and 5 (trailing centre and trailer on the trailing 3 car set)
If we are back tripping due to a defective trip, what do we isolate?
Yellow TEC
What is the procedure when there is a brake pipe rupture in the lead motor?
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
What is the procedure for a brake pipe leak on car 6?
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
What is the procedure for a brake pipe defect in cars 4 and 5 with a competent employee?
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
What is the procedure if a competent employee is not available for a brake pipe rupture in cars 4 and 5?
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
What is the procedure for a ruptured brake pipe in cars two or 3?
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
