An InterlockingA general term applied to the setting and releasing of Signals and Points to prevent unsafe conditions arising; also the equipment which performs this function.... More in which standardAn authorised document, including specification, procedure, instruction, directive, rule or regulation, which may set mandatory requirements. More pre-assembled modules are provided for
each Signalling FunctionA Signal, set of Points or other part of the train control system. More, arranged and electrically interconnected in a
geographical manner. See also Free-Wired InterlockingA Relay interlocking that comprises individually wired relays rather than prewired sets. More.