Atlas HO Scale Turntable Motor Retail Price : $35 .95 Internet Trains Price: $28.76 Item Number: ATL-304 Quantity in Shopping Cart: None Fully assembled. Used this belt driven, quiet drive unit to motorize the HO scale turntable #ATL -305 . review (s ) Atlas Turntable Motor , 10 .1 .2011 Reviewer : Adam S (Old Bethpage, NY) I had used one of these many years ago. I worked like a charm but was a bit loud, even with the cover on top of the unit. Hopefully Atlas has made them more quiet.