Can you mod the map itself?

[Ricky B]

And remember Peter, the roads and rails can't be as straight as in reality, as they run hex center to hex center, basically. So while a rail line may be perfectly straight for miles, on the map it can't be unless it is following the hex grain in whatever direction. So that doesn't account for the real kinks you showed originally, but at least some of the later rail images make sense on this basis.

Rick