AR-1 and auto reversing a turnaround wye

[Puddlejumper]

See here 2 wyes I drew up real quick in paint. Is this what you are talking about? In either case, 2 sets of gaps on both rails are necessary. In the case where the track between 2 turnouts is isolated that portion of track should be longer than the longest train you plan on turning on the wye. The auto-reverser will change the polarity of the rails instantly when the loco's leading wheelset bridges the gap.



Either arrangement will work, but I think the top one is more common.