SINGLE AND BI-DIRECTIONAL LINES

Question 1

Define a Bi-directional line?

[1]

Answer 1

Used on multi track layout, movements are signalled in both directions with no priority over direction

Question 2

Define a single line?

[1]

Answer 2

One line available for movements, signalled in both directions it is therefore by definition BI-directional

Question 3

What is the overall principle of a single line?

[1]

Answer 3

one train in one section at one time

Question 4

What are the two main risks of single lines?

[2]

Answer 4

collisions- head on

tail end

Question 5

What does a train staff look like?

[2]

Answer 5

block of wood with brass plate, written on it is the route it applies to. Also a key at one end

Question 6

On a one train working line where a train staff is provided, what is your authority to enter the single line?
[2]

Answer 6

staff

signal

Question 7

Where must the staff be kept when the train is in motion?

[1]

Answer 7

in the leading cab

Question 8

In what four circumstances would you not need the train staff in order to enter the single line?
[4]

Answer 8

Line under possession
Assisting a failed train
Modified working
Pilotman working

Question 9

On a one train working line where staff is not provided, what is your authority to enter the single line?
[1]

Answer 9

Signal

Question 10

What is the main risk of one train working without staff?

[1]

Answer 10

Collisions, due to SPAD of section signal

Question 11

What two ways will you identify that you have received or released the correct token for the signal?
[2]

Answer 11

brass plate tells you what line it applies to

colour coded

Question 12

when working single lines with a token, what is your authority to enter the single line?
[2]

Answer 12

Token

Signal

Question 13

Where is the token kept when a train is on the single line?

[1]

Answer 13

Leading cab

Question 14

If there is more than one locomotive at the leading end of the train, what rule applies with regards of the token?
[1]

Answer 14

Both drivers must see it and it is to be kept in the leading cab

Question 15

On electric token block lines, when may you enter the single line without the token?
[5]

Answer 15

authorised past section signal for shunting
assisting a failed train
evacuating passengers from a failed train
remove portion of a train
remove a train that has entered without authority

Question 16

If a portion of a divided train is to be left on the single line and you are taking the front portion forward, what must you do prior to leaving the single line?
[1]

Answer 16

inform the signaller

Question 17

Your train has failed on a no signaller token single line and the assisting train requires the token to release the ground frame. You must take the token to the ground frame. What do you do next?
[3]

Answer 17

give token to assisting driver
come to a clear understanding of what actions are to be taken
inform the signaller

Question 18

There are two circumstances where trains can be operated under one train working regulations. What are they?
[2]

Answer 18

token instrument failure

obstruction- working to and from