Sn3 track is 9/16th's" actual gauge which is 3' in S while HO track represents Sn42 or 42" gauge. Shinohara sells Sn3 flex track and #6 switches. The rail is code 70.
http://www.sceneryunlimited.ne...oducts/shinohara.php
Fast Tracks sell turnout jigs for any size rail you want to use and also regular track jigs.
Greg