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70年代初，德国DB铁路提出了要开发和制造用于代替轨道汽车的VT628型内燃动车。自1985年开始第一批动车交货。到目前总计交付了3种结构系列的VT628型内燃动车459辆。这些订货将在1995年交付完毕。包括样车在内DB铁路总计将得到474辆VT628型内燃动车。本文论述了内燃动车的进一步发展；介绍了VT628．4／VS928.4型两种动车主要的改进之处，如改进了内部设计、更舒适的上下车通道、加大了发动机功率、采用了新型传动装置和改进了的转向架等；指出了其成效卓著的由高的经济性所体现的产品开发方针。
In the early 1970s, the German DB Railway proposed to develop and manufacture a VT628 diesel that will replace a rail car. Since 1985 the first batch of motor car delivery. To date, a total of 459 units have been delivered with three structural series of VT628 diesels. These orders will be delivered in 1995. Including prototype vehicles, DB Railway will receive a total of 474 VT628 diesel vehicles. In this paper, the further development of the diesel-electric vehicle is discussed. The main improvements of the two-vehicle VT628.4 / VS928.4 are introduced, such as improved internal design, more comfortable access to the vehicle, increased engine power, Gears and improved bogies, etc .; pointed out that its effectiveness and high economic efficiency embodied by the product development guidelines.