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[quote user="CGW121"] So it takes the place of the DPDT switch? Does train length matter? [/quote] Yes it does. That is a matter of contention.  I posed this question a while back. Until a recent rebuilding project, my club had a psx-ar controlling the entrance to a staging yard via a wye.  The reversing section was on one leg of the wye.  And the layout has operated at the amherst show in springfield for 10 years.  The revesing section is ~1.5ft long.   On my home layout I have a wye with a 2ft revesing section powered by an AR1.  Longer than the longest locomotive you own seems to be the minimum requirement.
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