In recent years, more and more factories choose low-voltage rail flat car to replace the crane or forklift to transfer heavy equipment, because the crane running range of one-time handling mobile objects less, and forklift intelligent transport small volume and small tonnage of equipment, encounter across the workshop handling is more trouble, so many companies enterprises in the workshop to increase the over the car transport equipment, so as to greatly improve efficiency. Low pressure rail series electric flat car box beam structure, simple structure, easy to use, strong load-bearing capacity, can start and stop frequently.