OK, say HTC doesnt expand trains, How often do you fly over HQ anyways??? and when you do, your at crazy alt.
Now lets say they do expand, HTC won't likely put trains where many furballs happens, Plus there may be only a few maps hat dont have a big ocean,sea,lake in the middle which means spread out, small islands. When you do fly over a train they shoot at you when your only like 800ft from them.
Just some of my ideas.
-JRjolly