I recently acquired one of these locos in a rather distressed state. One of the renewals decided upon was the pick-up and lower chassiscomponents. There is only one type for the 8 variations. After assembly the speed and traction was minimal. Problem = brake shoes on the rear pair of drivers were not only touching the rims but pushing the Axel up to its max compression. After rechecking I could not find an assembly problem so I cut off the shoes. Q? is this a common place problem?