N&J slipping and more

The wheels spin and it won't move? Are traction tires on the engine?  G

Traction tires are on the first and fourth set of wheels.

all foam was removed from between the engine and wheels. 

tension on spring on the drawbar was set both ways with no change.

all other features worked properly, it just will not pull through curves.

I also oiled and tried adjusting the screw tension on the drawbar. I

thought it might be too tight and binding/not pivoting on the curves. 

It it did not make a difference.

Is a front or rear pilot miss adjusted such that the drive wheels are raised slightly?  Is a pickup roller bent up and not collapsing on the spring and this is raising drive wheels up of track?

Is a tender truck bound such that the tender wheels are locking between rails and acting as a drag on the engine?  Same with any connected cars.   G

Everything looks normal and screwed down tight,

one clarification, traction tires are only on the last set of drive wheels. This is the way it is designed.

As for the F unit coming to life while attempting to run the J Both may have the same ID number. Take one off the track and edit it's address to another ID. If you need a hand how come on back.

The J....Are the rollers lifting the engine up a bit...  Or are  the front pony trucks in the correct position . I think I might look at them upside down  at the work bench. good luck. 

Can't explain it, I guess the last check is the gauge of the drive wheels. Are they too wide and binding between outer rail?  G