I measured .548 length on the intermountain wheel sets. I installed an IM set into a new MT truck and it turned but it was pretty stiff.
Thanks! Fortunately, I solved the mystery I presented earlier. It seems I had some Micro-Trains trucks mixed in with the Intermountain trucks, and when I removed the wheels in the trucks I thought were Intermountain trucks, the wheel axles were really .540" instead of the .553" axles I thought they were. So they turned fine in replacement Micro-Trains trucks, thus confusing me.
Ah, if all my problems could be solved with an "Aha!" moment.
Hmm... I give thanks
that Kiz didn't screw
this up any more than
he did...