Hello Ted. I did the same thing - tore out my Fastrack and replaced it with Atlas to kill the noise. I have two reversing loops. It was a simple as using DZ-1000 switch machines on the Atlas switches to add anti-derail functionality. Mine work flawlessly in the manner you describe (no manual switching required).
Although Atlas made anti-derail boards for their switch machines, they are long gone and Atlas told me they won’t make them again. The DZ machines cost the same as the Atlas boards, so you get anti-derail functionality for the same cost as the add-on boards. They are very easy to wire.
If you search the forum for adding anti-derailing functionality to Atlas switches, you’ll get a lot of good info, including suggestions for how to buy the DZ-1000s (hint: buy them from a reseller and not directly from Z Stuff).
