Xtrap Pneumatics

Question 1

What equipment uses Main Res Air?

Answer 1

Braking system
Trip
Horn
Auxiliary panel

Question 2

Main Res pressure?

Answer 2

750 - 900 kPa

Question 3

Main Res Safety Valve?

Answer 3

980 kPa

Question 4

Brake Pipe Pressure (in normal operation)

Answer 4

0

Question 5

Holding Brake Cylinder pressure?

Answer 5

120 kPa

Question 6

Full service brake Cylinder pressure?

Answer 6

190 kPa

Question 7

EMERGENCY Brake Cylinder pressure?

Answer 7

210 kPa

Question 8

At what pressure do both compressors start operating?

Answer 8

When main res is below 650 kPa

Question 9

At what pressure will one compressor shut down?

Answer 9

When Main res pressure reaches between 750 & 900 kPa

Question 10

What do air dryers do?

Answer 10

Remove oil, dirt and water

Question 11

What does compressor Gov do?

Answer 11

Tells compressor when to turn on & off according to Main Res pressure

Question 12

If compressor Gov is isolated what will compressors do?

Answer 12

On a 3 car:
If already running they will continue to run without stopping
If it was already stopped they will remain in the state they are in.

On a 6 car:
There are 2 Compressor Governors so you must turn both cocks for the above to occur on both trailer cars

Question 13

What does Auxiliary res supply air to?

Answer 13

Friction brakes (air brakes)

Question 14

Main res pipe connects main res to which equipment?

Answer 14

Auxiliary res on all cars
Auxiliary pneumatic panels
Coupler
SPB

• also charges brake pipe when needed for rescuing

Question 15

What are the 5 cocks in the Aux pneumatic panel?

Answer 15

Whistle. —
Uncoupling. —
Trip cock reset. —

Trip cock active |
Aux pneumatic panel |

Question 16

What is the primary suspension ?

Answer 16

2 rubber mounted springs on either side of each axle box

Question 17

What is the secondary suspension?

Answer 17

Rubber mounted springs
Bump stoppers
Vertical & Lateral Dampers

Question 18

What are the 4 Braking systems on Xtrap?

(Not types)

Answer 18

Service Brakes
Holding Brake
Emergency Brake
SPB

Question 19

When does EP friction brake (disc/ tread) apply?

Answer 19

Whenever ED is ineffective, when wheel slide occurs, ED removes and EMY braking

Question 20

When ED braking is the only brake applied, do Tp car brakes apply?

Answer 20

No because Tp cars only have friction brakes ( EP)

Question 21

Does EP brake continue to apply when train speed is under 0.5km / h?

Answer 21

No

The EP will release & holding brake will apply automatically on all disc & tread brakes.

Question 22

What is the holding brake pressure of the holding brake when the master controller is on all braking positions and coast position?

Answer 22

Remains at 120 kPa as long as train is stationary

Question 23

How can a SPB be released?

Answer 23

Manually by unlocking the release cable with an AX key, then pulling the handle

Cannot be applied

Question 24

At what Brake PIPE pressure will EMY BRAKE apply (Safety loop opening) during rescue ?

At what pressure will Safety Loop close again?

Answer 24

When below 300 kPa

Will close again when above 430 kPa

Question 25

What are the only settings of the EMS (EMY mode switch) that the brake pipe is charged ?

Answer 25

3 - Rescued
4 - Rescuing
5 - rescuing in propulsion