@gunrunnerjohn posted:If turning the smoke unit on is the trigger, you need to be looking at wire connections and possibly a bad smoke unit fan motor.
I don't understand the "wheels spin upgrade", what does that mean. That sounds like it's losing traction, not motive power.
I should have said that wheels will start to spin while going up the grade. I agree it is losing traction. But this seems to be only when the smoke unit(s) are turned on. If I turn on the smoking whistle the loco usually stalls.