Dude wants to pay $15 per month to be a train engineer. He wants to be able to hide the train in a tunnel! I actually laughed at that. Maybe we could have hundreds of tunnels so we could all do it... sitting in the dark hiding. Beats dogfighting or fighting tanks - right? 
Well, first, It's my $15, so who's to say I shouldn't spend it that way.

Seriously, if nothing else changed in the strat system, then yes; it would be pointless and boring. If a more interactive role could be worked into the game, such that I could chose to spawn a train to make a resupply run (and it was closer to the front lines) than I don't see it as being any different than taking an M3 to resupply a base. If you've ever done that, you know that it is a typical tactic to scoot from stands of trees to barns and such to avoid marauding aircraft, and of course you'll man your lone and mostly useless single MG and shoot back when one finds you. I wouldn't recommend such a change for barges, of course...just too slow to be of any point. As I said in my previous post about this, I'd like to see towns supplied by trains, and bases supplied by towns via trucks (both with their own man-able guns). Also, have a major rail yard as a strat target affecting rebuilds of other strats (because back then, everything shipped by rail).