And my 2 lionel TMCC Lionel F3s have torn out 2 idler gears because they don't like each other... so I made them work together. They run much better without the idler gears now with only 1 drive axle... just like the F7s.
I had a Sunset F7B running really slow and hot vs the other three, but I found the screw heads on the motor mount were rubbing on the flywheel. When it was assembled, the flywheel just got pushed on too far.
My Sunset FP7s have been flawless from day one.
Honestly I was going to send my F7s back because of some of the inaccuaracies... why did I keep them??
The horizontal drives! I can't wait to get my SD7 Tiger Stripes.