A relayAn electro-mechanical switching device used in many types of Signalling Systems. More based 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 system controlled from a route setting panelA panel which embodies the controls and displays the condition of all associated Signals for a Route in a specific geographic location. See also Route Setting. More.
Usually refers to a Free-Wired InterlockingA Relay interlocking that comprises individually wired relays rather than prewired sets. More.