I love the idea of having multilple things to manage: the fuel, collision avoidance etc.
The instructions felt overwhelming at first but it turned out way easier actually.
I wish I could see further ahead because a couple times when I saw another train it was already too late (although this issue was already mentioned in other comments).
Adding some fitting music could elevate the experience as well.
Also, seems like there is no reason to keep any carts besides the engine, maybe something could be added to make these more important, e.g. using these carts for additional fuel storage.
Overall, this is a fun and enjoyable concept, add a bit of polish and it will be a great game. Nicely done!