Translations:Air Brake System Overview/4/en

Brake pipe is a system of air lines spanning through a train. On a properly coupled train, air lines are connected between individual vehicles with their valves open. At the ends of the train, however, the air line valves are closed. This allows the pipe to be pressurized at 5 bar in normal running conditions, by the main reservoir. The volume of a brake pipe is relatively low, but it grows bigger with each additional coupled vehicle.