I found what the problem was with the broken upright. The four uprights fit into channels cut into the outside of the wagon compartment. The right rear upright was set too close to the wagon compartment putting pressure on the dowel end of the upright when assembled. Also, the channel had a crown in it halfway from the top to the bottom that made the upright rock from top to bottom. So when the whole thing was tightened down, the top of the upright pulled in, the crown in the channel then forced the bottom out, which was already under stress from the tight fit of the compartment....and snap!
I was able to drill holes into the upright and the undercarriage by hand. I glued the spliced repair in place using a small maple dowel. I also took a chisel and removed the crown in the channel and slightly sanded the inside of the upright to make a better fit. The front upright was just reglued back into place.
That handled, I put the first coat of Testor's Enamel Dark Red 1104 on the undercarriage. It will require one, maybe two more coats.
The wheels are progressing. The third wheel is apart. It had a severe split down the center of the bamboo, which is now reglued. The bamboo strip is pre-forming in the retaining ring overnight so I can begin reassembling it tomorrow.
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