Week 1 & 2 Jan

Question 1

What is the principle of absolute block?

Answer 1

To prevent more than one train being in a section on the same line at the same time

Question 2

What is the definition of the absolute block?

Answer 2

The line between the last stop signal (which can be a section signal or a IBHS) controlled from one signal box and the home signal controlled by the next signal box.

Question 3

Station limits

Answer 3

The line between the home signal and the section signal worked by the same box in the same direction of travel

Question 4

What is the intermediate block section?

Answer 4

The line between the section signal and the IBHS worked by the same signal box in the same direction of travel

Question 5

Clearing point

Answer 5

The point beyond the home signal up to which the line must be clear before a train can be accepted as shown in regulation 3.4.1

Question 6

Clearing point track circuit

Answer 6

The track circuit or circuits beyond the home signal that controls the block indicator

Question 7

Home signal

Answer 7

The first stop signal controlled by a signal box that controls the exit from the absolute block section

Question 8

Section signal

Answer 8

The stop signal that controls the entry to absolute block section or IBS

Question 9

IHBS

Answer 9

The stop signal that controls the exit from a IBS and the entrance to an ABS

Question 10

What are the clearing point distances?

Answer 10

Semaphore 400m. Colour light aspect 183m

Question 11

7 Bell codes no attention

Answer 11

2
3-5-5
6
1-1-6
1-2
2-5-5
4-5-5

Question 12

What criteria must be met before offering train to signal box in advance?

Answer 12

Receive train out of section (2-1) for previous train. Block indicator for the line concerned must be normal

Question 13

Sending train entering section to advance signal box

Answer 13

When the train passes the signal box or location in the signal box special instructions

Question 14

If there is an IBHS when may you clear the section signal for the train to enter the IBS before offering the train to the signal box in advance

Answer 14

As long as the track is clear up to and including the overlap track circuit beyond the IBHS

Question 15

If a train is beyond your signal box before it has been accepted by the signal box in advance and you have an IBHS, when do you send the train entering section?

Answer 15

When the train has been accepted by signal box B and the IBHS has been cleared

Question 16

As what point can you send train out of section after you have observed the tail lights on the back of the train

Answer 16

When the train has passed the clearing point, or passed beyond a facing junction, and you have set the points for another line which is clear, to the clearing point of the line, or has been shunted clear of the running line

Question 17

Before allowing a train to approach from signal box in rear you must make sure, what?

Answer 17

The line, or a facing junction the line to which the facing points are set is clear up to and including the clearing point

• All points within the clearing point have been set for the safety of the approaching train
• No conflicting movement has been authorised that will cross or foul the clearing point
• No train has been accepted from another direction that requires a portion of the same line with the clearing point for acceptance

Question 18

You must not allow the clearing point to be obstructed for a train that has been accepted, unless?

Answer 18

• Train stopped at home signal
• Train passed beyond any points or crossing that you need to use within the clearing point
• You have received cancelling from signal box A
• The train has failed

Question 19

Returning signal to danger or caution in front of a train

Answer 19

You must contact the driver on GSMR

Question 20

If a signal has been replaced to danger the signaller must make the driver aware, first before …

Answer 20

• They permit any obstruction of the route the signal applies to
• Move any points within the route

Question 21

Stop signal that has been cleared for a train to proceed must be replaced to danger, when?

Answer 21

• As soon as the last vehicle of the train has passed the signal
• When there are facing points the last vehicle is clear of the points
• When the driver has been aware the signal will be returned to danger
• Immediately in an emergency

Question 22

Unable to release a signal, you’ve receive line clear (2 bells) but this fails to release the section signal, you must?

Answer 22

• Treat section signal correctly locked at danger.
• Tell the signaller in last box what has happened.
• Instruct the driver of the train to pass the signal locked as danger