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在1930年代的初期,当瑞士遭到严重的經济危机,私营客車竞爭剧烈的时期,瑞士联邦铁路就研究了可以用来改进旅客服务和降低成本的方法与措施。幸好,在1925～1930期間,已經积极进行了电气化,已能使用电气机車来牵引85％的运量。形势是特別有利于改进旅客列車的运行。就在这个时候,采用了輕型結构的客車,以进一步减小列車的总重。在这里,将首先討論四軸輕型客車的結构問題,
In the early 1930s, when the Swiss economy was experiencing a severe economic crisis and private-owned passenger cars were fiercely competitive, the Swiss Federal Railways examined methods and measures that could be used to improve passenger services and reduce costs. Fortunately, during the period 1925-1930, electrification has been actively carried out and electric locomotives have been used to tow 85% of the capacity. The situation is particularly conducive to improving the operation of passenger trains. At this time, the light structure of the bus used to further reduce the total weight of the train. Here, we will first discuss the structural problems of four-axle light passenger vehicles,