Rick, I don't have it here but I thought the wall wart didn't have a ground pin... I'll look! The wall wart plugs into the TMCC with a co-axial plug I think it's only 2 conductor. EDIT: looks like the Legacy base has a grounding wall wart... but we need THAT to keep the O gauge layout working well on Legacy.
GRJ... that will work on a 2 rail S layout? Just ground one rail? Seems like the TMCC signal is traveling around the room on the building ground wire... wouldn't grounding one side boost the signal?
Obviously, I have no expertise in tmcc/legacy...