Today I picked up a somewhat rare Mantua camelback 4-4-2 that I expected to be a shelf queen. Surprisingly it runs like a Swiss watch, but it does have problems. The locomotive is missing its pilot truck, which is unique to the camelback Atlantics. I will probably have to fashion a new part, unless someone here can find a suitable substitute. The more complex problem is that the engine needs an insane amount of power. I use a standard Kato power pack and it always does well, but this model won't get going until the knob is halfway over. There are no visible issues with the mechanism, and I tried to open up the chassis to check the lubrication, but all of the gears appear to be fully encased in a plastic housing. I'd love any advice you all might have.
EDIT: Forgot the picture! Here it is. The wheel treads are clean even though the sides are not.
