Permissive Working
on a railway in the United Kingdom allows more than one train at a time to be on the same line in a
block section
Absolute block signalling is a British signalling block system designed to ensure the safe operation of a railway by allowing only one train to occupy a defined section of track (block) at a time. Each block section is manually controlled by a ...
, a
signal
A signal is both the process and the result of transmission of data over some media accomplished by embedding some variation. Signals are important in multiple subject fields including signal processing, information theory and biology.
In ...
section or a dead-end
platform
Platform may refer to:
Arts
* Platform, an arts centre at The Bridge, Easterhouse, Glasgow
* ''Platform'' (1993 film), a 1993 Bollywood action film
* ''Platform'' (2000 film), a 2000 film by Jia Zhangke
* '' The Platform'' (2019 film)
* Pla ...
line.
Authorisation
The areas where Permissive Working is allowed are given in Table A of the
Network Rail
Network Rail Limited is the owner (via its subsidiary Network Rail Infrastructure Limited, which was known as Railtrack plc before 2002) and railway infrastructure manager, infrastructure manager of most of the railway network in Great Britain. ...
Sectional Appendix
In Great Britain, the Sectional Appendix is a Great Britain railway technical manuals, railway document compiled by Network Rail and is the official definition of railway infrastructure, giving a detailed description of all railway lines owned b ...
.
Exceptions
Even where it is not authorised, a
shunting movement can be allowed to enter a portion of line that is already occupied providing that it is for the purpose of:
*attaching vehicles
*detaching vehicles
*removing vehicles.
Driving towards another train
When it is permitted to drive a train towards the rear of another train, such as where trains queue to enter or exit a depot, the driver must:
*proceed with caution
*not pass a signal which has been cleared for the train in front until it has been replaced to danger and then cleared for their movement.
References
{{Rail-stub
Railway signalling block systems