I don't understand your comment Barry.
When he starts with powering up the TIU channel with the transformer, it all works as intended and all the engines see the WD.
When he powers up a siding with a toggle taking power from a an already powered TIU channel, he won't get a WD.
Where's the problem? That sounds like normal operation to me, and I can duplicate it here with any transformer.
OH, FWIW, the MRC transformer was specifically mentioned when I was at MTH as being a problem with certain installations, so that may be part of the issue.
