When I had Fastrack and the postwar milk cars and platform, I removed the one side of the operating track. Then a big hammer to flatten the part that held the tubular track. It just became a big flat plate. Set distance to edge of track. I had straights on both sides of the operation track. If there are curves, overhanging engines or cars will hit the platform. Set the platform to the top height and then screw down the track when all adjusted. I went to tubular so can't take a picture.