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J.J, in part I can answer some of your questions. I suspect the 85' superliners, like the 85'budds are also 36". There are a bunch of-rules of thumb- because of a variety of freight cars and there are exceptions to those rules, but the following is only a partial listing that I picked up from another site. Some of the newest hoppers(1980's) may use 38" on 125 ton sideframes. 38" on 125 ton trucks on anhydrous ammonia. 36" 54' ACF center flo's, 50' tank cars, 100 ton coal hoppers, cylindrual covered hoppers, 2 bay 100 ton capacity hoppers, 2 bay ACF covered hoppers, 40' cement hoppers. 33" box cars 40 & 50', flat cars, cabooses, 34'& 40' granules hoppers. Beer can cars can vary depending on the density & weight of cargo. Auto rack cars may use 28" for clearance reasons. Remember, when reinstalling you must have sufficient clearance with the truckside frames and the bottom of car. As Greg pointed out previously, changing wheel size, changes coupler height. What is needed is a universal wheel set ID listing like what is available with the knuckle couplers.
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