brakepipe

== English == === Alternative forms === brake pipe === Etymology === From brake +‎ pipe. === Noun === brakepipe (plural brakepipes) (rail transport, mechanical engineering) A continuous pipe or hose filled with high-pressure air and running the length of a train, used to recharge the train's brake reservoirs with compressed air and to control the train's air brakes through changes in its internal air pressure. ==== Synonyms ==== train line, trainline