Hi Chris,
I am using RouteBuilder to build Tyne Valley and used it to build Aln Valley. If, like me, you don't want to fathom out the codes for handcoding, it provides a method for doing it graphically. You can even scan in a map and use it to "draw" your railway. I'll disagree with Damon again about "simple" though - I believe it's possible to construct quite complex layouts in RouteBuilder... for example, this screenshot shows my interpretation of Pelaw Jct between Heworth and Sunderland:
And RouteBuilder allows objects to be placed simply and accurately, like this new overbridge (with thanks to Craig Allan for the bitmap for the bridge parapet)
But more importantly, using RouteBuilder's route definitions enables you to define which track the train will run on, and define lots of variations if you wish, very simply... I believe handcoders have to recode the whole route just to get a train to use a set of points and run "wrong line"....
If you are interested in using RouteBuilder, I'll happily act as a "mentor" to help you get under way....
Regards
eezypeazy