Bulk freight that is not weather sensitive was always important cargo for the railroad. For that reason a total of 16,200 units of the type Otmm 70/Ed 90/Fc 090 were built. This made them the German Federal Railroad's side dump car built in the largest quantities. With a wheelbase of 6 meters or 19 feet 8/14 inches and a length over the buffers of 9.64 meters or 31 feet 7-1/2 inches, these cars offer a load volume of 40.0 cubic meters or 1,412.4 cubic feet. The car by itself weighs 11.6 metric tons. During unloading the load slides to the openings arranged in the center of the car. These openings are closed off by slide gates that make it possible to measure the rate of unloading. The load is guided from the exit openings via chute extensions to the side of the car.