I realize that this should be in the gameplay forum, but I like to start positive threads after reading so many negative ones from time to time:
I see the potential for a new strat structure forming from this, maybe not at first when trains get here, but it leaves pandora's box open for a new strat model.
~Front line high-performance fighters availability:
Add this to the "perk plane" side of the house, where ones strat can be affected by trains and routes, if no trains are making it to the front lines, a country is limited in production of certain plane types like FW190-Dora, or LA7's, or P51D's...you know, the higher performance type fighters.
~Fuel/Ammo supplies:
Again, one could have several different train types that would provide various weapon types and/or fuel types to "front line" fields, ie. the fields closest to the front.
~Ack Wagons:
A few trains will most likely have the 'flip-side box' where the enemy strafer will be faced with some lead coming back at them, this will be one way to help protect their precious cargo.
~Drivable!
I would very much enjoy an occasional run down the tracks, listening to broadcasts from local countrymen of imminent attacks (remember, trains did not have radar!), adds yet something new and 'fun'.
Throw your comments in, I'd love to hear what you'd like to see.