Hi, It looks like your logging wagons have an issue with the model. What I can describe is the most forward point (close to the locomotive) has the wheels wobbly when they rotate. so it's probably an issue with your placement on the model. The other end of the wagon, the rear...there your wheels are fine, they rotate correctly.
More Details. So I saved the scenario and got back to it after awhile. In the saved game, the problem changed the behavior. After the saved game is loaded. the most rear wheel set, show the wobbling behavior and the most forward wheels are not doing it.