After a long development stage, the first production Trough Train bodyshell rolls off the line on July 20, 2022 I had major problems developing the articulation joint and door locking system. I printed 8 or 9 prototype cars, each with slightly different changes, testing door clearances, truck screw hole sizes, articulation and other aspects of the car. For the doors, I settled on magnets. This was a major aspect of my preproduction printing. I needed to test different arrangements and angles for the magnets, and printing new car bodies was the easiest way to do it. I wanted them to be strong enough to support a coal load, while still being easy enough to open for unloading. It was the least mechanically-intensive design and seemed the most practical. There is a magnet on the bottom corners of the doors, and magnets embedded in the body of the car. They attract each other to snap shut. I plan on having wayside magnets at the unloading site which pull the doors open as the train rolls past. The articulation joint reverts back to a similar design theory used on the Trough Train 1.0. Initially, I had an elaborate floating baffle system with springs that worked similar to Talgo or Turbotrain monoaxle trucks. It was too much of a hassle to assemble the car, so the final design is greatly simplified. It will improve reliability and make storage and disassembly of the train practical. I pack up my trains often, so I needed an easy way to take the cars apart to put in a box. The model shown above has the supports sanded down, but there are some other details I still need to add, like internal bracing and jacking pads. The doors will be installed after painting, which I am doubtful I will finish by the end of the summer.