The irresponsive, still activated brakes were misdiagnosed by the technician (who had to service three trains at the same time), who did not report this to the driver, but reset the brakes by emptying their air reservoirs.
The irresponsive, still activated brakes were misdiagnosed by the technician (who had to service three trains at the same time) to have a pressure higher than what the engine supplied. He did not report this to the driver, but reset the brakes by emptying their air reservoirs.