Ok, my thread on the Menards tank cars got me curious so I did some measuring. Enjoy:
First, Menards UTLX Tank Car
Menards Box Car:
Lionel MPC era Box Car:
MTH Wood Car:
Atlas O Trainman passenger car:
Williams NW2:
MTH GP9:
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Well, the track gauge should be 1.250. The tires are wide, so an axle a little narrow should not be too much a problem. however, a wide gauge such as the Williams NW2 or the MTH GP9 I would think would have a tendancy to climb frogs in switches.
They are all below 1.25. Some well below.
With the huge treads, slight narrowing of gauge is not that bit a problem. Now if your tread is down around 0.135 then things begin to get a little demanding, 
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