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the mainline ones may have used the same tooling also. But the drive systems were different on each version. The tooling originated from the P1K version.
I have two of these locomotives in the CP Canadian red what I’ve noticed though it’s kinda weak. I have a Santa Fe from a Bachman starter set that has way better pulling power and runs much faster. The locomotive is silent the Santa Fe is loud but I noticed right away much slower.
I would try and just have it run around your layout for a little bit and see what happens. These ones ran a bit rough until I got them ran in a bit. And if that doesn't work I would call Walthers, they can probably help you out.