Stan, John & Mike - Don't know why my diagram isn't showing up - it does on my computer. Based on Stan's diagram I now understand (I hope) what needs to be done. Need to connect the common on the train transformer to the common on the accessory transformer (#3). They are phased.
I thank you Stan for the diagram as I am a visual learner and it helped greatly. John's patience with me is to be admired!!!
Paul