I bought a boat load of Intermountain wheel sets a while back and found that maybe 50% of my cars I tried them on worked without derailing going thru the "made for 3-rail" Signature Switch turnouts (code 148 2-rail) due to the frog. I have some pretty crusty trucks on a few of my cars and I'm thinking that's what's causing the problems, just don't know what brands they are. I haven't found any trucks for sale that don't come with wheels yet but I'm still looking. In the mean time I've converted the few I did back to 3-rail wheels, except for the Smoky Mountain Model Works Southern gondola I put together last year which is running fine using Athearn 2-rail trucks.
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