长大货物车是指用以装运特别笨重或庞大的货物的铁路货车。如用于装运重型机器、涡轮发电机、大型变压器等。有的底架两端高、中间低，呈元宝形，故又称“元宝车”。还有钳夹车、落下孔车等多种型式的长大货物车。
长大货物车的承载框架结构设计，是长大货物车设计中的关键技术问题，也是组合式长大货物车的一种创意。
The structure design of load-carrying frames for heavy-duty wagons is the key technology in design of heavy-duty wagons, as well as a creative idea for combination type heavy-duty wagons.
长大货物车的承载框架结构设计，是长大货物车设计中的关键技术问题，也是组合式长大货物车的一种创意。
The structure design of load-carrying frames of heavy-duty cars is the key technique in the design of heavy-duty cars, and is also a creativity of the composite heavy-duty cars.
该系统针对长大货物车的结构形式，可实现方案设计、总体构图、部件设计、车辆限界校核及工程数据库管理。
That system aims at the construction form of Long and Big freight car, can realize scheme design, total composition, parts design, Stock-limits examination and engineering database management.
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