Exit route without gate

[Cluster01]

Setting the exit route flag, with wall thikness of 2, the second layer of walls is missing the gate for the train to exit.

[demipixel]

Arg, I've been struggling with this for ages. According to this it should be accounting for wall thickness. Maybe it needs to be <= instead of <?

[Cluster01]

It could be.
Comparing it with this (which works) the differences are <= and 3 .
Surely it is for the 2x2 dimensions of the rails.