The M250 was designed for moving light parcels faster than regular freight trains could to. Therefore it is an electric multiple unit that can carry containers at a speed of up to 130 km/h. Each set consists of 16 cars, of which the first two on each end are being powered by four 220 kW three-phase traction motors each. Each of the motors has its own inverter. These cars can only carry a single 31-foot container and have crew and equipment rooms on both ends. For the first time in any vehicle of JR Freight, the cabs had a combined power and brake lever. The twelve flat cars in the middle of the train can carry two 31-foot containers each, what makes a total of 28 containers per train. Kawasaki, Nippon Sharyō and Toshiba built two full sets in 2002 and 2003, along with a total of ten spare cars. They are officially being dubbed “Super Rail Cargo” and are being operated by Sagawa Express between Tokyo and Osaka.