The hinged "RotoCover®" is a cost-effective cover system that unlocks and opens automatically, and at the appropriate juncture, closes and re-locks in the same manner. It is a fully automatic cover system that is ideal for both hopper and gondola cars. For hopper unloading, the cover would remain closed. To excavate a gondola car, the cover can hinge open to allow safe access for the excavator. The RotoCover® system can also be matched with a specially designed rotary dumper for high-speed unloading.