excellent concept... BUT
MAJOR gameplay flaws... Only on easy, the trains come way too fast for, let's say I did an error, a little trajectory tweak... So as soon as you mess up just a tiny bit once, you're essentially effed.
Also, you should know what type of train is leaving the station BEFORE the train is actually out on the tracks... At the second era (1910 or something) you couldn't see the type of train before the train actually hit the built tracks...
Also, if you don't want to tweak things so that they are a little slower, then make it so that : if there is a civilian train going out, then there shouldn't be another train going out of the city if, let's say, the civilian train has been the last train to exit its station...
In my opinion, your "easy" difficulty is actually pretty hard.
Excellent concept, but some gameplay flaws that really make this game a lot too hard to be enjoyable. I hope you make it a tiny bit "easier" so that this becomes less of a frustration and more of a train collector's wet-dream...