The rail of a single rail track circuitAn electrical device using the rails in an electric circuit, which detects the absence of trains on a defined section of line. that is fitted with Insulated RailThe rail of a single rail track circuit that is fitted with Insulated Rail Joints to electrically separate the sections. Also known as the Signal Rail. Joints to
electrically separate the sections. Also known as the Signal RailAn alternative term for Insulated Rail..