Section 232.711 - Train air brake system tests(a) Supervisors are jointly responsible with inspectors, enginemen and trainmen for condition of train air brake and air signal equipment on motive power and cars to the extent that it is possible to detect defective equipment by required air tests.(b) Communicating signal system on passenger equipment trains must be tested and known to be in a suitable condition for service before leaving terminal.(c) Each train must have the air brakes in effective operating condition, and at no time shall the number and location of operative air brakes be less than permitted by Federal requirements. When piston travel is in excess of 101/2 inches, the air brakes cannot be considered in effective operating condition.(d) Condensation must be blown from the pipe from which air is taken before connecting yard line or motive power to train.