[Previous] -- [Matt's Lego Roller Coaster] -- [Next]
From this end view you can see that there is a 1 stud gap between rails. The less gape there is the less the rails will spread as the train goes by. The 1x2 blue sloped pieces you see also prevent spreading in the middle of each rail.
[Previous] -- [Matt's Lego Roller Coaster] -- [Next]