The Fire Detection Unit is suitable for WAP5, WAP7 & WAG9 classes of locomotives and its variants. It can also be adapted for any type of rolling stock. It is fitted inside the machine room of Locomotive to detect smouldering fires as well as flaming fires that produce smoke. The Fire Detection Unit gives an alarm warning signal to Cab-Pilot along with the LED indication. It is also interfaced with the vehicle control unit which generates error messages and also initiates automatic tripping of high voltage circuit breaker in case of detecting smoke and/or fire.

The Fire Detection Unit contains two smoke detectors, suction unit with air-flow monitoring, visual indication of Operation, fault/malfunction, Alarm, connection for pipe with 25mm outside diameter, potential free relays.