A nice concept, but not very innovative. Derail Valley is a similar game and well over 2 yrs in development now. Whether that is a good thing or not, remains to be seen. If Simteract can keep up a decent speed in developing, they sure might beat Derail Valley to the punch.
As of yet (beta 0.5), there is a lot to be desired for and one can notice how early access this really is. A lot of bugs, missing content and confusing AI behavior. Also the mix of US lights and signs in a German setting, while AI trains mostly drive on the left side (like in the UK), doesn't make things better either.
All in all, a nice game, but very early days... so Simteract, keep it up people, looking good so far.