Signalling Functions that control, releaseThe removal of Locking on a function, for example, the removal of Route Locking or the unlocking of a function such as a Ground Frame. More or are released by other signalling
functions for a particular layout. Signalling controlsSignalling Functions that control, release or are released by other signalling functions for a particular layout. Signalling controls are expressed in a Control... More are expressed in a
Control TableA part of the Signalling System specification that defines the detail of the Signalling Controls for each Signalling Function. More.