Luckily I found a new in box Roundhouse RS3 kit, unbuilt, undercoated. I built the thing per the instructions. Made two laps at slow speed without issue. On the third the front gearbox top came off as the front truck self destructed. It was moving slowly at 30% power. Pulling four cars. All 34' boxes. The trucks were the only factory assemble part. Any idea why this occurred? How can it be fixed? Attached is the diagram from the instructions.
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