Route relay interlocking
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Route relay interlocking (RRI) is a system of interlocking comprised of electrical relays. It was often used in large and busy stations that have to handle high volumes of train movements. In this, an entire route through the station can be selected and all the associated points and signals along the route can be set at once by a switch for receiving, holding, blocking, or dispatching trains. Since the 1980s, new interlockings have tended to be of the electronic variety.
Route Relay interlockings are known as Entrance-Exit in the USA. The GRS system is referred to as "NX" from eNtrance eXit, and US&S system is titled "UR" for Union Routing.
One main feature of route relay interlockings is that the buttons by which routes are defined are placed directly on the track diagram, rather than underneath the diagram as on CTC panels or conventional interlockers. Route relay panels generally display more dynamic information about the state of an interlocking than the track occupancy lights associated with earlier systems.
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