I posted this last year and I was hoping to have the rest of the cars this year, but life got in the way. Maybe next year my American Freedom Train will be complete.
The MTH 4449 and MTH GP40 barely get this train moving, even after oiling all wheels. The GS4 needs to be on straight track.
I have the dummy GP40 that matches this WP powered one, so I need to buy another MTH GP40 and swap shells to have two helpers. This is actually prototypical as the WP, as well as other roads, did have two helpers* with the train although most movements just had one.
*The GS4 rarely needed helpers for this 26-car train. They were there mainly as advertisement for the railroad.