The Train Tunnels event seems to only cover the upper entrance/elevator areas, but I'm actually more interested in making the underground stations and maybe the tracks PvP (basically anywhere the tunnel dweller NPCs can be). Is there some way to accomplish this?

Update: Both TruePVE and NextGenPVE allow you to auto-exclude areas above (sky, dungeons) and below (tunnels) certain heights.

It's a work-in-progress, but I've overhauled Zone PVx Info extensively to recognize these as PVP areas, as well as to recognize safe zones as PVE areas.