of all the layouts I've had while doing trainz since it's inception. there is only one that I felt like it was part of a real railway with mainlines and branches. I'm working alot on that and IF!! i Finnish it will be a route that will run fine in MP.
I know there are lots of protityplcal routes. but I want fun not sitting in the cab for an hour before I get to the "next thing to do"
The Mojave route seams to be quite popular with players
It's not about size its about intrest... check out the 2 board layout I made once Peco on the DLS, Anyway this layout was not made by me it is just fun to use