This was so much fun! Fantastic idea, fantastic execution. I spent so much time playing it just because it's a great game. I'd buy this on Steam if it were expanded into a full game.
The main areas that posed a (non-fun) challenge for me were the contrast of the text, figuring out which train corresponds to which destination (due to 3, 5, 8 looking similar, and 6, 9 being inverted sometimes), and rotating around junctions to the right orientation (since often you might just want two or three valid states).
But really the game was amazing. I ended up making a silly shunting yard approach to (safely) get everyone to their (correct) destinations towards the end of the game, even if this caused some delays. I imagine there could be a lot of potential for more dynamic networks if you could, say, pre-create network configuration and apply them with a click or hotkey, and maybe also automate some things (e.g. "switch this junction after a train passes through it").
I hope you continue expanding this game, because I'd enjoy playing more of it!
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