Indeed for us, the rail is indispensable, and society would not exist without it as it does today.
I think my world is close to Mad Max's independent states where we find there's this undefended rail down the desert into the middle of nowhere that's being maintained in perfect condition for no apparent reason.
I mean the ballast there is extremely well maintained. Xrell's enemies would surely let the outbound rail deteriorate since they don't have to go anywhere (Consider the city run by Tina Turner's character... It seems she doesn't need to move rail guns to new war zones. She's not waging conquest, and her economy is closed - why bother moving lots of goods?).
Indeed, by destroying the rail, Xrell's enemies may choke his economy while not changing their own.