Permissive Working^[1] on a railway in the United Kingdom allows more than one train at a time to be on the same line in ablock section, asignal section or a dead-endplatform line.

The areas where Permissive Working is allowed are given in Table A of theNetwork RailSectional Appendix.

Even where it is not authorised, ashunting 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.

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.

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