How about the Bez Rail Layout?
http://i.imgur.com/SXxTV8t.jpg

Simple rules:
a) trains on the right hand side
b) track is spaced as close together as possible
c) all blocks must be designed so that when the maximum length train is parked at a signal it is not blocking an intersection.
d) diagonal track must at all times cut a corner where ever possible.
e) 3 way rail intersections designed as 3 intersections with 3 blocks used with the train length point c in mind.
f) signals are placed on the outside of twin tracks, not the inside how left handed train operation works
g) all stations have a diagonal leadin section which will allow track spacing to be as close as possible.
h) all stations must contain only one platform, any further platforms need to branch off the line further down the line, point c again
i) stations are part of the intersection block which diagonally leads in.