Puddington, How is the alignment on the other end of the point rails where they meet the stock rails? I had one atlas turnout that was causing derailments and came to find out the problem was not at the points, but the opposite end where the point rails meet the stock rail coming from the frog. It was just ever so slightly, a couple of passes with a file cured the problem. A couple of passes with a file on all areas concerned might cure the problem? Does the turnout check out OK with a NMRA gauge (Points, flangeway and track) ??