Good afternoon. Just to add to what Jay already said above, it most ceryainly can be done. I have found that making a mold for the side frame to slip into is an easy way of making sure the side frames sit flat for drilling and to help keep everything square. I use all ball bearings in my walthers Milwaukee cars as these cars tend to weigh about 3-4 pounds a piece. I can literally push a 5 car train down the tracks with my pinky and they just keep rolling. Definitely the way to go with most any passenger car.
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