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五十年代末和六十年代初,随着各国铁路运量的增长和要求运行速度的提高,很多国家相继提出了对大功率内燃机车的需求。当时西欧各国一些主要干线已开始实现电气化,对内燃机车提高功率的要求主要是用于高速客运及在部分未实现电气化的线路上与电力机车衔接。对于货车牵引定数较高的美国,铁路牵引基本上全部使用内燃机车,过去一直用多机联挂的办法来解决重载货运的需要,最多时重联
In the late 1950s and early 1960s, with the growth of railways in various countries and the increase of operational requirements, many countries successively put forward the demand for high-power diesel locomotives. At that time, some major Western European countries have started to electrify the main trunk lines. The demand for increasing the power of diesel locomotives is mainly used for high-speed passenger transport and convergence with electric locomotives on some un-electrified lines. For the United States, where the number of trucks towing is relatively high, the railway traction basically uses all diesel locomotives. In the past, it had always used the method of multi-machine linkage to solve the need of heavy freight transport and reconnected at most