EOTT is digital device communicating over radio frequency between loco, last wagon and control room.

The EOTT consists of a CDU (Cab Display Unit) or Cab unit that displays the information to the train driver, and an SBU (Signal & Brake Unit) that is mounted on the last wagon of the train. Both the CDU and SBU are fitted with GPS receivers and GPRS capabilities to report it location and other vital information to the client's server and server as a tracking device for the equipment and the train.