Rail transfer trolleys are an electric transport trolley on rail tracks that address product transport between factory spans. Also known as cross-bay rail trolley, cross-transfer table, electric flat car. The utility model has the advantages of simple structure, convenient use, easy maintenance, large carrying capacity, and less pollution. Widely used in machine building, metallurgical factories, as a workshop to cooperate with cranes to transport heavy loads. the powered by the battery, cable drum, or rail powered, etc.