A locking mechanism for releasing a Ground FrameA control point containing levers or switches to permit the local operation of Points in Running Lines, Sidings and, where provided, the associated Signals. Thi.... The key to unlock the
Ground FrameA control point containing levers or switches to permit the local operation of Points in Running Lines, Sidings and, where provided, the associated Signals. Thi... is held captive in an Annett’s instrument or lock which can
be released remotely from the Signal BoxThe building in which the Signaller(s) is/are situated together with the control and indication system for the signalling. See also Signalling Centre. and interlocked with the
signalling.