Brake System

Question 1

What is the difference between step 3 and emergency?

Answer 1

Emergency provides the train with 1 extra bar of brake. Must be used if you feel the train may not stop in time.

Question 2

What trips of the main reservoir pipe pressure is below 6.2 bar?

Answer 2

The low main air governor.

Question 3

What do we do to the train wires to apply the brakes?

Answer 3

De-energise them.

Question 4

How will the air suspension influence the brake cylinder pressure?

Answer 4

The variable load on the vehicle will be reflected in the brake cylinder pressure.

Question 5

What in the driving cab in use, will prevent brake release?

Answer 5

Train brake MCB 
Train control MCB
AWS/TPWS
DSD 
Vigilance
Emergency plungers

Question 6

What in the rear driving cab will prevent brake release?

Answer 6

Train brake MCB
Local Brake MCB
Emergency plungers
Brake handle in emergency
Key in an another cab

Question 7

What other items on the train will prevent brake release?

Answer 7

Pass comm pulled
Main air governor
Brake reservoir governor
Drum switch in wrong position

Question 8

How can we prevent air going into the brake cylinders on a vehicle?

Answer 8

By use of the BIC

Question 9

What are the potential risks after carrying out the actions in the question above?

Answer 9

Reduced brake force
No brake on a end vehicle
Passengers in a un braked vehicle.

Question 10

If a train brake control MCB in a rear driving cab will not reset what isolation switch can be used to release the brakes and state the risks?

Answer 10

EBS.
The risk of people in rear of the driving cab not being able to use brake handles to apply an emergency brake. All unit emergency plungers are inoperative.

Question 11

Will use of the EBS overcome a brake problem in that driving cab?

Answer 11

No

Normally it will be neccesary to go to another cab if signaller permits