Just wanted to throw this out there:
I see by the Lionel parts website that all the wheel/axle sets for this engine are currently available; I wonder if the "flanged" #1 wheel/axle set might be a simple drop-in replacement for the #4 "flanged" wheel/axle with the traction tires. The engine itself weighs 4 1/2 pounds, so it seems like that would be plenty heavy enough to still be a good puller without those TTs.
Is anyone willing to guess on the "swap-ability" of these items?
Mark in Oregon