Thanks. I had nothing to lose so I gave it a shot last night. Unfortunately, the wheels are too far out on the axles and rub on the trucks. In trying to set the wheels in with a brass tube and a small hammer, I did the following:
1. One wheel moved and the other didn't/wouldn't.
2. Ended up bending the axle.
3. Peened the nice needle point over on the end of the axle trying to return the wheel back to its original position so it would fit back on the car.
So in a word: FAIL.
The needle axles pierce anything soft enough to not harm the end of the axle, and peen over against anything hard enough to keep them from moving.
Short of some sort of wheel press (sounds expensive), I don't know how to make this work.
"Nicer looking rolling stock" would defeat the purpose. This is a collection of short/traditional boxcars from starter sets that I have been collecting since 1979. I have gathered a total of 15 cars that carry real road names, but a couple of them still have the stupid plastic wheels.