Scott, those trucks are fitted with a slide shoe. I just experimented with one of my MTH O-gauge tinplate cars (from set 11-5510-1). It's a freight car but it has the same slide shoe trucks as your set. I laid it on its side and tried to roll the wheels like you said. It does the same thing. The wheels facing up spin more freely. The "bottom" wheels get some drag. It's just gravity I think. My cars roll perfectly when placed on the track. So my guess is something else is causing your problem. Incidentally, I ran into a different problem with slide shoe trucks last week (they trip when passing over FasTrack switches and uncouple your cars, so watch for that).
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