I have and regularly run 3rd Rail Q2, Q1 and T1 duplexes. The S1 is just too big for my O72 mainline curves. I tested one here when they first came out and chose not to buy it. All of my duplexes have been reworked with Cruise Commanders and RailSounds (Lionel T1 sounds in the T1, Lionel S1 sounds in the Q's). They run great and are real crowd pleasers.
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