I recently received 4 of these cars, three with knuckle couplers, and one with Rapido's, which though larger, will work with MicroTrains couplers. The problem I have with all the cars is the wheels are extremely tight, and do not roll freely on my track. In fact, at a train show this past weekend, my loco could barely pull them. Has anyone had a similar experience, and/or come up with a fix for this problem (short of replacing the trucks with MicroTrains units, which are not prototype for these cars).
Are these coaches lighted, if so, that is the source of the problem.
I managed to fix the problem, though it involved removing the lighting contact strips from each truck, which were binding the wheels. I also took a small round file and slightly enlarged the slots holding the wheels. A touch of lubricant, and lo and behold...free wheeling.