I was watching an old reruns of the great old TV shows hosted by Rod Serling when I came up with an idea of how to mix my facination with the strange and a layout that I am planning. The layout is to be an interchange of three different lines so as to diversify the types of cars that it would handel, but I wasn't sure which three lines to pursue. While watching the show I got to thinking, what if I used three lines that have no physical connection to each other. Talk about a deversification of rolling stock! Now, I am admittedly not a railfan so I need some help. I need suggestions for three major lines that don't interchange with each other in the real world, so that I can connect them in my little corner of the Twilight Zone.