LOW RAIL (INSIDE RAIL) by Metro Digital Resources Librarian • April 14, 2016 The inner rail of a curve that has at-grade alignment, whereas the opposite or outer rail is elevated. (TRB) Share:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Reddit (Opens in new window)Click to email this to a friend (Opens in new window)Click to print (Opens in new window)Like this:Like Loading... Related