Abstract: In an electronic track relay, electronic relay circuitry receives an input track signal coded at a pre-determined code rate, and regenerates the input track signal at the pre-determined code rate after a predetermined time delay. A driving circuit is coupled to the electronic relay circuitry for receiving the delayed track signal therefrom and conducting, at the predetermined code rate, at least a power source to at least one of various components in a railroad signaling system. A latching circuit is configured for latching the driving circuit into one among a plurality of configurations respectively corresponding to a plurality of different signaling location types, depending on a signaling location type of the railroad signaling system in which the electronic track relay is installed.

Abstract: An electronic code following relay for use in a railroad signaling system includes a timing circuit for receiving an input square wave signal coded at a pre-determined code rate, and regenerating the input square wave signal at the pre-determined code rate after a predetermined time delay; and a driving circuit coupled to the timing circuit for receiving the delayed square wave signal therefrom and conducting, at the predetermined code rate, at least a power source to at least one of various components in the railroad signaling system including a rail of a track. The electronic code following relay is preferably microprocessor-based and uses an opto-coupler and various solid-state relays for conducting various DC and AC power sources to the components of the railroad signaling system.