19世纪60年代初期,美国的铁路还处于“铁”的时代,无论桥梁还是路轨都是铁造的。铁路及桥梁事故时有发生。在铁路局任职的卡内基,早就觉察到这是一个有待解决的问题。 一天,卡内基在报上看到一则消息,称欧洲有人发明了炼钢法,他马上意识到这意味着铁的时代即将终结,谁能捷足先登,必将前途无量！但他考虑到自己财力有限,便马上与弟 In the early 1960s, the U.S. railways were still in an era of “iron”, both on the bridge and on rails. Railway and bridge accidents have occurred. Carnegie, who serves on the railway administration, has long been aware that this is an issue to be solved. One day Carnegie saw a message in the newspaper saying that some people in Europe invented the steelmaking method and immediately realized that this means that the iron age is coming to an end. However, considering that he had limited financial resources, he immediately became a brother