Hi John,
Have a look at this pdf file, bottom of page 8:
https://www.lionelsupport.com/media/servicedocuments/71-4091-250.pdfThe Automatic Gateman is wired differently when using an insulated track vs. the 153IR.
I was going to circuit trace and send you photos of mine until I came across the above pdf which is worth "a thousand words".
Good luck!
Roger