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Although there are many types of vehicles, their structures are similar. This should be said to be the credit of standardization and the need of large-scale production lines. With the development of society, the progress of science and technology and the change of demand, the appearance of railway vehicles has begun to change, especially the passenger cars are no longer the same old faces. However, their basic structure has not changed significantly, only the specific parts have more scientific and advanced structural design.

Generally speaking, the basic structure of a vehicle consists of five parts: body, underframe, running gear, coupler buffer device and braking device.

The car body is the part of the vehicle for loading goods or passengers, and it is also the basis for installing and connecting other components of the vehicle. In the early days, the car bodies of vehicles were mostly wood structures, supplemented by steel plates and bow bars. Modern car bodies are mainly steel structures or light metal structures.