Thanks to all, but I guess I should have been clearer.
North Penn S Gaugers run on American Models Track which accommodates both Hi-Rail & Scale. I am going to use FlyerChief engines with cars modified to scale. Perhaps just changing the couplers would be enough, but I did like the idea of scale wheels/trucks.
On my home layout (when it gets built), I will be using FastTrack (with the rumored wider radius track and switches). I have friends who run scale and wanted to use my cars on their layout as well (can't use hi-rail on the scale track).
Once again, thanks.