I have a Heljin turntable that has provisions for motorization. I have not bought the motor kit for it since I long ago decided not to build my Railway museum on my layout. (maybe I will on a module). As for being DCC I dont know of any decoder that would work with indexing like a standard DC setup would but the DCC decoder would easily work just like on a loco. Most turntables I have seen use a toggle or momentary switch and a simple logic board to control movement. Or just a simple toggle and you stop it when needed with no indexing.
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Owner of the South Massey Railway.