The Barite crushing facility in Battle Mountain will have a long enough siding for six 2-bay covered hoppers to be moved through the loader. One car can be loaded at a time and then the string of cars will need to be moved one car length to get the next car under the loader. I began to wonder how an industry like this moves railroad cars down the track without having their own locomotive.
I keep all my small styrene scraps in a sandwich sized Tupperware bin and that is the first place I go to get materials for a project like this one. All of the stryene came from that bin. The spool sides were punched from a scrap of .020 styrene sheet with a hole punch. The motor is .125 styrene rod and the shaft is .020 brass wire. The control / reduction gear housing is .080 x .125 strip and the doors .020 x .125 strip. Some copper magnet wire was wrapped around the spool.
Another shaft from the reduction gears then exits the cabinet to drive the pulley. This would all need to be securely anchored to a thick concrete slab.