The invention discloses a covered freight train device capable of being used for a tipper. A groove is cut in the carriage of the train device, the size of the carriage slideway is matched with the size of a rolling door; the two sides of the rolling door fit with the carriage slideway; and a lock nose is arranged on the head of the rolling door for fixing and connecting, a handle is arranged on the head of the rolling door, and brushes are arranged on the two sides of the head of the rolling door. In the covered freight train device, one end of the rolling door is fixedly connected with one side of the carriage, and magnets are arranged on the two sides of the rolling door. The rolling door can be prepared from hard materials such as steel and aluminum plates and also from metal woven or nonmetal woven material with keels for support. The invention has the advantages that goods can be completely covered, thus avoiding windage loss and environmental pollution; and the tipper can be used for fast unloading.