The present invention provides a freight train chassis and a freight train, the freight train chassis includes: a first chassis module, a plurality of connecting module and at least one second chassis module, the first chassis module and the second chassis module are disposed along a length direction of a freight train, the second chassis module is connected to the first chassis module by one or more connecting modules of the plurality of connecting modules, and the second chassis modules are connected by one or more connecting modules of the plurality of connecting modules. The freight train chassis and the freight train provided by the present invention can adaptively adjust the number of the second chassis module as required for different sizes of goods or containers, thereby adjusting the length of the freight train chassis, which improves the adaptability of the freight train to different sizes of goods and the space utilization rate of the freight train, and improves the transportation efficiency and transportation volume of railway transportation.
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