自从19世纪火车诞生以来,因制动不灵而酿成的交通事故时有发生。为了解决这个难题,美国人威斯丁豪斯开始了研制高性能制动器的工作。起初,威斯丁豪斯心想:“既然火车是靠蒸气来推动的,那么,我为什么就不能靠蒸气来制动呢?”怀着这一想法,他动手设计了一套装置,这套装置,由一根管路把锅炉和各个车厢连接起来。在他看来,只要蒸气推动 Since the train was born in the 19th century, traffic accidents caused by poor braking have occurred. In order to solve this problem, Americans Westinghouse started the work of developing high-performance brakes. At first, Westinghouse thought: “Since the train is driven by steam, why can not I brake with steam?” With that in mind, he designed a set of devices, This device, by a pipeline to connect the boiler and each car. In his opinion, as long as the steam to promote