Here is a photo of three-rail dual gauge track in Columbus. As one can see in the link, the gauges don't differ much. Did this track require special rail profiles on one side of each track? I know that three rail dual gauge heavy rail track does involve narrow footed rails when the two gauges differ by only slightly more than the rail width. Did this track shown in the photo mean a speed restriction (even away from points and crossings) that did not always apply to single gauge track?
Also known as Myrtonos