The build date of this Koeppel side dump car is unknown. This work service car was designed to haul material such as ballast or larger rocks and dump them alongside the tracks to help stabilize the roadbed. It could also be used to dump other materials along the track. When in the closed position, the car resembled a traditional gondola. Large air cylinders underneath the car could tilt the floor of the car to either side. As the floor’s incline increased, the carsides raised up to separate from the floor, allowing material to flow out the side. Air was provided from a locomotive via its air brake line. #711 was donated to a museum and used in 1970. It was occasionally used to haul and dump material for the museum but has been stored in recent decades.