I put the Williams Genesis A-A on the track with two track cleaning cars in trail (simulated load), and ran it for around 20 minutes at a good pace, probably around 60 scale MPH average. I didn't feel any significant difference in the shell heat. The bottom of the truck was at 105F, that's bolted directly to the motor. That's hardly above room temperature, it's around 83 in here right now. I tried again at a slower pace for another 15 minutes as that's at a lower spot on the DC motor efficiency curve. The results were virtually identical. The truck was 107F, but it was already warmed up from the previous run.
I confess I really didn't feel like taking them apart to measure actual motor temperature, but from the comments about the trucks getting hot, I figured this was close enough.
