I get the idea of it. But it is hard to survive long. A score over 20 seems already good. I also think that keyboard control to switch the 4 signals would make it even more enjoyable. Maybe a little bit more delay between the trains would also be an idea.
Viewing post in Train Signals jam comments
I just play this game from this jam:
https://itch.io/jam/untitled-game-jam-106/rate/3368303?before=4#post-12329286
It is similiar to your game (different style though) but to play it with keyboard controls was more compfortable to play.