三、4D轴单元煤炭列车敞车主要结构的方案设计由于单元列车敞车要采用上述主要引进件并要符合上述的特殊要求。因此,该敞车的设计在许多方面既不同于美国单元列车敞车的设计,也有别于我国传统货车的设计。 Third, 4D axis unit Coal train gondola main structure of the program design As the unit train gondola to adopt the above-mentioned main introduction and to meet the above special requirements. Therefore, the design of the gondola is different from the design of the gondola in the United States in many ways and the design of the traditional truck in our country.