Permissive Working

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 a block section, a signal section or a dead-end platform line.

The areas where Permissive Working is allowed are given in Table A of the Network Rail Sectional Appendix.

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: 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: This rail-transport related article is a stub.

You can help Wikipedia by expanding it.

The smaller signal arm is a 'Calling On' signal, which when showing 'Proceed' allows a train to enter a section already occupied by another train