For reliable indication of stationary and driving trains on the track and for use as an electronic switch. Operation The occupation detector reports any driving current above and including 1mA in the isolated section which it monitors. It reacts this way to stationary and driving locomotives and cars with lighting. It is possible with connected lamps of all types LEDs relays switches and signals with current switching of high output current of up to 1 A or other components e.g. sound modules. The integrated relay with two floating change-over contacts which may be loaded with 1A permits many switching possibilities without additional components. Apart from use for reliable reporting on the track plan desk the occupation detector is suitable for the triggering switching sequences timers or other components - and all this without visible logic elements in the track. When using lit end cars the device also reliably reports uncoupled railroad cars. Any other car is detected if the isolation of the axles is bridged with graphitic or resistance lacquer.