The TRAFIX scheme employs Linear Heat Detecting Cable (LHDC) to monitor for fire conditions within rail vehicles and provides both external and internal alarms, together with automatic operation of the train braking system.

Each vehicle is equipped with a control unit which operates from the train/carriage supply. The carriage controllers have associated batteries such that fire protection is maintained for a period after supply removal / locomotive disconnection.

The TRAFIX scheme incorporates a signalling technique which identifies to the driver the carriage initiating any alarm occurring. The driver’s display and signal scheme includes test and fault monitoring features.

The TRAFIX equipment automatically accommodates train re-marshalling, including reversal of carriages, and does not require operator/driver re-programming action.