Red and yellow hoses carry compressed air between carriages on a train and so forming a circuit for use in the trains breaking system. Coupling cocks are located in line between the carriage and the hose and are used to isolate a carriages air supply if required. The system is fail-safe and in the event of loss of system pressure the breaking system will be engages.

The hoses and cocks are periodically removed from the train and sent to Tidyco for overhaul. The overhaul procedure consists of stripping all parts, shot blast and paint, all rubber hose and seals are replaced, rebuild and test in accordance with the manufactures instructions.