众所周知,列车在长大下坡道上运行,保证制动充风和随时掌握行车速度是关系到行车安全的大问题。在中外铁路史上,列车在高坡区段运行,因超速或机后风管折角塞门被关闭未被发现,以致制动失灵,造成列车“放飏”的重大事故时有发生,目前已引起人们的高度重视。 As we all know, the train running downhill in the growth, to ensure that the brake charge and keep track of speed is a big issue related to traffic safety. In the history of Chinese and foreign railways, trains running on the high slope section have not been discovered due to the over-speed or post-aircraft duct corner closures being closed. As a result, the major failures that have caused the train to “let go” have occurred and are now causing People attach great importance.