Single Line Working Flashcards
What is the rule for trains on a single line section?
Only one train is allowed at a time on the single line section.
What ensures only one train is in a single line section at a time?
There are a number of fail safes in place.
Who is responsible for ensuring the correct procedure on the single line?
It is the driver’s responsibility.
What does the signaller provide to the driver for single line operation?
The signaller hands the driver a single line staff.
What does the single line staff authorize the driver to do?
It gives the driver authority to enter the single line section to the next signal.
Can other trains enter the single line without the staff?
No, no other trains are permitted to enter the single line without the staff.
What happens when the driver arrives at the other side’s signal box?
The driver will hand the staff over.
How is the staff transferred between trains?
The staff is passed back and forth as trains go from one end to the other.
Why can the process of returning the staff be lengthy?
You must wait for a train to come the other way to return the staff.
What is an electric token?
An electric token is a system used to manage train movements on a single line section.
What happens when a train arrives at SB(A)?
SB(A) contacts SB(B) using bell and buzzer codes to ask if the line is clear.
What does SB(B) do if the line is clear?
If SB(B) accepts, they will release a token from the machine at SB(A).
What occurs when the token is removed from SB(A)?
Removing the token prevents the removal of any additional tokens from the system until it is placed in a machine.
What happens upon arrival at SB(B)?
The token is replaced into the token machine.
How does SB(B) notify SB(A) after the train is out of the system?
SB(B) notifies SB(A) that the train is out of the system.
What is the No Signaller Token System (NST)?
A system where a driver contacts a signaller to release a token (key) for a single line.
What happens when a driver arrives at a token hut?
The driver contacts the signaller asking for a token to be released.
What does the signaller do if the single line is clear?
The signaller releases the token to the driver.
What occurs after the driver removes the token?
The signaller cannot release any further tokens until the token is replaced into the system.
What must the driver do after replacing the token at the other side’s token hut?
The driver must contact the signaller to confirm the return of the token.
What does SB(A) do to check if the line is clear?
SB(A) asks SB(B) if the line is clear.