铁路双层客车能够大幅度地增加载客量,这一特点早已被人们所认识。十九世纪七十年代,一些比较发达的资本主义国家就率先发展双层客车,而这时铁路本身也只是处于其发展早期。 1870年,法国和德国首先使用双层客车。法国在巴黎西郊,德国在阿尔套纳(A1-ton)-基尔(Kiel)区间使用双层客车。当然,早期的双层客车定员少,车内设备亦很简陋。随着铁路客运量的增长和科学技术的不断发展,双层客车的使用数量也相应增加, The double-decker bus can greatly increase the passenger capacity, a feature that has long been recognized. In the 1870s, some relatively developed capitalist countries took the lead in developing double-decker buses, but the railway itself was only in its early stages of development. In 1870, France and Germany first used double-decker buses. France In the western suburbs of Paris, Germany uses double-decker buses in the A1-ton-Kiel interval. Of course, the early double-decker buses were less well equipped and the equipment in the car was very simple. With the growth of railway passenger traffic and the continuous development of science and technology, the number of double-decker buses has also increased correspondingly.