Switchers stalling? Please no.

[faraway]

Reinhard;

I've been trying out your suggestion some and it seems to be the rear truck under the cab, which of course doesn't have much weight on a model like this. Also noticed that when only touching one wheel set of the rear truck to the track that it seems to get no power, whereas doing the same with the front truck it does get power....

Ed, in that case the first I would do is to reseat the two cables from the rear truck in the plastic clips of the main board. Checking the same cables at the truck side would require disassembling some more parts and would be the next logical step if required.
Good luck!