Krois-Modell KM6051, 4x Balise

The Eurobalise is a special version of the Balise. Technically, it is an inductively coupled transponder that, mounted between the rails of a track, is energized when the vehicle passes over it and sends a message (telegram) to the vehicle. Its counterpart on the vehicle is a balise antenna. There is no provision for feedback about the correct receipt of the error-safe message. There are balises with a fixed message, as an electronic mile marker, and those that receive current messages from the signaling equipment, similar to a signal.

The Eurobalise is standardized as a safety-relevant element of the European Train Control System (ETCS) by the European Railway Agency (ERA), but is also used in numerous other signaling systems.