Sorry I have to ask about this but I have looked through about 20 pages here on the forum and couldn't find any info about them BUT I know I've seen it. Just can't find it. Wanted to upgrade my Ashland Central Route but after I selected session I saw that I had lost all my mainline track. I used JR's dirty grey terrain and it's listed in the dependencies but it's not showing. The spline point are visible but I can't connect to them unless I delete them which tells me that there is a track connected to them but not visible. Sometimes I get the white dotted lines and I think there is a method by which I can change the white lines back to my mainline track. Any one remembers how to do this?