Hi! had to replace traction tires on two older MTH steamers - NW J and NYC Niagara. These locomotives are from 15+ years ago, but are still great! The J was fairly easy but the Niagara was a real bear, with piping and brake shoes making it really difficult to get traction tire on the wheel. However, I finally was successful - a combination of a small flat-head screwdriver, lots of patience and luck prevailed. Now, I need to get additional traction tire replacements from the MTH folks at York. Hope they have the sizes I need. A number of my other older steamers likely will need them. Want to get all of these old engines going!