Cheryl,
Is this a possible stumbling block for the DCS signal?
Typically, an out-of-phase condition would manifest itself when a connection is made between two power sources that are out-of-phase.
Since all of your Commons are tied together, that means that any time a momentary connection is made between two out-of-phase Hot wires, there should be noticeable sparking and the possibility of a fuse blowing or a breaker tripping.
Typically, this would occur in out-of-phase electrical wiring when a train transitions from one track block powered by one transformer to a track block powered by another transformer that's out of phase with the first transformer, or when a switch track that is powered by a transformer that is out-of-phase with respect to a track power transformer, operates the switch track's automatic non-derailing mechanism.
If you aren't seeing anything resembling this, I would expect that your transformers are in-phase with respect to one another.
