BLW had a powered conversion Peco turntable at one time - it is not available right now, but I am sure an email will find out if it is out of stock or no longer available. The Peco turntable is very smooth, and is 80' long. A Kato USRA 2-8-2 will fit on it(as well as most diesels). LA Model Products was the source. Here is a web link for you to view:
http://www.blwnscale.com/L.A.%20Model%20Products.htm
Jim Bernier
Modeling BNSF and Milwaukee Road in SW Wisconsin
Peco makes a small turntable that would fit into my layout nicely. Does anyone know anything about this turntable, if it works ok, easy of building and installation and if a motor works with it? I see there is a web site that sells this table with a motor on it but thought I would like to try making my own. Thanks for any help This is an nscale turntable