There are some benefits of using trains over airships. First, crawling on land is usually more fuel efficient than soaring throughout the air. Second, trains can make long, extended journeys that airships cannot. Third, trains can carry more loads than an airship.
Even if all train tracks were inoperable, factions would be repairing them. There should be trains transporting valuable resources from mines to manufacturing centers (Airships would't be able to transport much at a time).
Also, our Skirmish Airships are not outfitted for long flights (no sleeping quarters, food storage, and restrooms). Extended campaigns would rely on Giant Air Behemoths or Train Airship-Carriers. Several Airships could be mobilized near places of conflict on board these trains.
So.. Muse... Trains?
(Can someone ask for me on the fireside chat and tell me their response? I can't make it due to being-in-school).