I like to re-use the same wheel so I made a new wheel in 2009 and have been modifying a copy ever sens. I use the "spin" method with 32 segments, if you use less the wheel will not look round. The "spin" method is just making the cross section of the wheel and spin is 32 times. Below is what I used whit Y being around 4", there is some of the image not showing where the center line is in the axle hole, I photoshoped it into a full wheel so that D was 33", I do not remember where I got this other than a website selling railroad wheel in 2009.
I detach the tread and flange then do the texturing as they have a shiny look. Then test in game, I do this a lot. Next I make a clone and flip it for the other wheel, note I do not make the two wheels into one object.
If you need an axle add it now, this can be 24 segments and will be covered later.
Next is to do the animation and test that it fits the track and that the animation is working right, this can be a nightmare.
After you have one set of two wheels working you can dup to make a 4 or 6 wheel bogey, just keep the names right.
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