Len,
I think I figured out the problem.
I put my NMRA Standards gage on the truck's wheels and found the rear wheel was a little tight.
I figured this out by lightly pushing the truck over the turnout and found the truck was binding on the rails between the points and frog on the turnout.
This lead me to checking the wheels.
Now I need to figure out how to adjust the wheels on the truck.
I think I figured out the problem.
I put my NMRA Standards gage on the truck's wheels and found the rear wheel was a little tight.
I figured this out by lightly pushing the truck over the turnout and found the truck was binding on the rails between the points and frog on the turnout.
This lead me to checking the wheels.
Now I need to figure out how to adjust the wheels on the truck.