OK Chuck, but I always thought if you wanted to have a true common, they needed to be phased the same on the primary, then tied together on the secondary. I know I did this with the ZW and VW I use on my portable layout.
My regular layout is a totally different animal, nothing postwar about it, not track, switches, trains, nor power supplies. I know my power supplies are phased together, because I installed the primary wiring myself and the power cords are grounded.