Many years ago on this list...way back when Tim Gilbert was still around...I posted data from the late Don Daily (retired from the NKP/N&W/NS) that described shipments from the soy bean processing plant served by the NKP in Frankfort, IN. Included in the outbound car movements were boxcars that contained used grain doors being sent back to the owner railroads. For example, an empty PRR car that had come in loaded with beans would be returned to the PRR via the PRR interchange in town with whatever loose PRR owned grain doors the plant had collected over some period of time.
