This machine is called Bridge Gantry Crane. 這種機器叫路橋門式起重機。
Successful development of the crane solves the problems of high-speed railways' unballasted track laying and brings obvious economic and social benefits. 博格板大懸臂門式起重機的研製成功解決了高速鐵路無碴軌道板的鋪設難題，創造了明顯的經濟和社會效益。
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