Rails get griefed so much they are useless, how about a staff approved railway system where it can be set where an npc can pilot rails (rail blocks only) for an indefinite size so that rails can't get griefed (the only concern here is the possible tps lag)
Sounds great. I was also thinking of this sort of thing recently.
To add to the suggested idea:
-> Instead of making staff fully responsible, leave it to individual nations to build and own these special unlimited "Transport Plots". A set of rules would be provided by staff to these builders, and staff would only intervene on report if the rules were violated,