One consideration with some MPC is the single motored units with traction tires.
After finding out how the singled motored 2240, 2243 or 2245 pull for fair comparison, my MPC B&O set from 1973 pulls quite well. I run the A-B-A set with a pretty good string of mixed type cars.
The strongest F-3s made were the MPC/Fundimensions twin motored diesels with traction tires on both trucks(the New Haven comes to mind).
They are all mechanically equal to the postwar versions, motors, trucks, E-Units, & chassis(all vertical motors, no horizontals).