Underframe

Question 1

What does the MR do?

Answer 1

Stores comp air for pneumatic equipment

Question 2

Where is the MR located?

Answer 2

B side of every car

Question 3

Where are the MR isolating cocks?

Answer 3

End of each car

Question 4

What do the surge res do?

Answer 4

Supplies comp air to the air bag suspensions at each bogie

Question 5

What do the brake supply reservoirs do?

Answer 5

Supply comp air to the EP valves to charge the BC

Question 6

Where is the primary suspension?

Answer 6

Between the bogie frame and the axle box

Question 7

Where is the secondary suspension?

Answer 7

Between the bogie frame and car body

Question 8

What is the secondary suspension?

Answer 8

Air bags

Question 9

What do the air suspension isolating cocks isolate?

Answer 9

Isolates the surge res for its bogie

Question 10

What are the isolating cocks under the coupler cover? (5)

Answer 10

Uncouple device iso cock
Towing unit iso cock
BP end cock
MR end cock
Horn isolating cock

Question 11

What is inside the brake control module of a Tc car? (5)

Answer 11

Brake supply iso cock
BC bogie 2 iso cock
BC bogie 1 iso cock
Tread scrubber iso cock
Sanders iso cock

Question 12

Where is the BCU?

Answer 12

Inside the BCM of every car

Question 13

What does the BCU do?

Answer 13

It’s a computer that controls the application and release of EP friction braking

Question 14

What is the primary suspension?

Answer 14

Rubber laminated springs

Question 15

What does the towing unit do?

Answer 15

Provides the means for HCMT brake control to interface with traditional brake pipe connections

Question 16

What does the aux power supply container have in it? (3) (BAM)

Answer 16

• aux inverter
• medium voltage box
• battery charger

Question 17

What is the purpose of the aux power supply system? (2)

Answer 17

• Converts 1500v DC to 415v AC
• powers the battery charger

Question 18

Where does 110v DC come from?

Answer 18

The battery charger

Question 19

How long do the batteries last for?

Answer 19

Min 2 hours

Question 20

What does the air supply unit (ASU) comprise of? (4)

Answer 20

• main air comp
• air dryers
• filters
• backup comp governor

Question 21

What does the shore equipment do?

Answer 21

Charge the batteries

Question 22

When does the trip lower?

Answer 22

When the master controller key switch is turned to on

Question 23

What’s inside the BCM of a DMp, Mp and DT car?

Answer 23

Brake supply iso
BC bogie 2 iso
BC bogie 1 iso
Park brake iso
Sanders iso

Question 24

What does the high voltage box do?

Answer 24

supplies power to the traction and aux power supply systems

Question 25

What’s in the HV box?

Answer 25

HSCB and harmonic wave detection device HWDD

Question 26

Variable voltage and variable frequency comprises of…? (2)

Answer 26

Two traction inverter TCU

Question 27

What does the VVVF do?

Answer 27

1500 v dc to 3 phase variable voltage and variable frequency for powering the traction motors

Question 28

Where is the auxiliary compressor?

Answer 28

On DMp cars only

Question 29

What is the purpose of the aux compressor?

Answer 29

Air for the Panto when MR is low

Question 30

When will the aux compressor automatically raise the pantos? (2)

Answer 30

Not enough MR pressure When car has been isolated from MR

Question 31

Where are the aux power supply containers?

Answer 31

Tc and DT cars