Override/Bypass Panel

Question 1

What are the 6 x switches on the Override/Bypass Panel

Answer 1

Doors Loop
Doors Enable
ATC Bypass
EB Loop
Electric Coupler
Deadman

Question 2

Doors Loop

Answer 2

Allows the Operator to override the doors when they cannot get an All Doors Closed & Locked signal. This includes the EDDs.

If door is damaged, detrain, train is returned to depot with doors loop bypass at no more than 40km/h.

Question 3

Doors Enable

Answer 3

Allows the operator to open all doors (left or right) when there is no doors relay indication.

Doors are opened using the Door Indicator Panel.

Question 4

ATC Bypass

Answer 4

Allows the operator to cut communication with the CBTC signalling system and is used when a signalling EB can’t be released.

Question 5

EB Loop

Answer 5

Used when a Rollingstock EB can’t be released as there is an issue with the train.

Question 6

Electric Coupler

Answer 6

Allows the operator to stop the Electric Coupler head from interfacing with a disabled train.

Question 7

Deadman

Answer 7

Allows the operator to bypass the Driver Safety Device if it is faulty. When engaged, there should be 2 x CJCTs onboard.

Question 8

List some Rollingstock EBs requiring the use of the EB Loop switch

Answer 8

ODDD Activation
Low air pressure less than 6.5 bars
Master Controller EB
Deadman EB

Question 9

List some Signalling EBs requiring the use of the ATC Bypass switch

Answer 9

EB activated by CBTC/ATC
Overspeed EB
EDR
PEA
Passing PPI at Stop

Question 10

Which 2 x Bypass Switches are located on the Pressure Gauge Panel

Answer 10

TMS Bypass
Brakes Loop Bypass

Question 11

Where is the Brakes Loop Bypass located and what does it do

Answer 11

On the Pressure Gauge Panel. It bypasses the Park Brake when it is triggered by the air pressure falling below 4.5 bars.