As part of our Albedo Project, N-FX in collaboration with Sally 4th have designed a modular sub way kit.
Although the original inspiration was sci-fi, this seems like a great setting for Post Apocalypse games.
We've had a lot of fun gaming on this terrain, during it's development. What makes it different is the multi-level aspect. We put ladders on the sides of the lift towers, so you can place a sniper up on the roof. The entrance hall is raised above the platform, giving good fields of fire, but there are lots of blind spots. There are also a variety of ways to deploy onto the table with 4 tunnel exits, two lift shafts plus the escalator.
At the moment the kits are only available through the Albedo Kickstarter:
https://www.kickstarter.com/projects/179272384/albedo-combat-patrol-the-28mm-sci-fi-miniatures-ga