It would be interesting if a train randomly showed up in Moorcraft for an hour to take you to an alternate Tier map with a special Strata 4 boss. Strata 3 could be the same as the gate you're in, but Strata 4 could be replaced with the boss Strata. You could make the train show up twice a day and have to ask the Desk Clerk Kat what times it will be there "Mew, the train will be here in X hours and X minutes. Mew!". If you made it show up twice a day it would be available to people in both the East and Western hemispheres.
Random hour because it would be something akin to a world boss that you can only do at certain times of the day, and mass transportation is well known for delays.
I'll let OOO or another poster think up a boss for the area, a Kat might be appropriate, but honestly I'm not good at thinking up bosses and mechanics for them.
~Gwen
I like it, perfect opportunity for the arrival of the Grimalking, summoned by Konjuring Kat himself! (this idea is supported by Nick as well, he posted it the topic the idea originated from)