Francine,
Do you have or can you get a picture of one of their turnouts? I did see the layout, but I did not look at the turnouts. At the time I was too distracted by the massive amount of smoke they were chugging out with Flyerhief Northern and PE Berkshire running at the same time! LOL
Tom,
Trout Creek Engineering/BK Enterprises did sell closed frog "TRU-SCALE HI-SPEED S SCALE TURNOUTS FOR HI-RAIL" in codes 125 and 148 that were advertised as capable of running both Scale and Hi-Rail. The website is still up (scroll down for the Hi-Speed Turnouts), but I don't know much about Trout Creek and I'm not sure if they are still available.
The Tru-Scale patent for the turnout goes back to the 1960's.
Thanks, Mike A.
P.S. If anyone is so inclined there were two articles in Model Railroader (9/81 and 6/11) on building closed frog turnouts. They were for HO, but I imagine you could use them as a basis for S.