... practice is to machine a short stubby flare on the rail head instead. The running rails alongside would normally be bolted to half chairs. Here is a photo from the S4soc web site, showing that: chairs04.jpg thanks to© linked from http://www.scalefour.org You can see that in order to support the special wing rail, the usual cast "B" chair has been replaced with a bolted slab& bracket design. To make these changes in Templot, use the real> adjust check rails... function: 2_032358_100000000.png (You won't be able to shorten the rail until you have first shortened the flare length.) The switch is a standard 12ft straight switch, modified for use by the auto tools> make tandem functions, see template> switch settings... menu item: 2_032358_110000001.png It has the same 1:32 planing angle as the "B" switch, i.e. you can prepare and fit it, and make the set in the stock rail, exactly as for the "B" switch. The modification for use ...