pretty impressive to get all this working as a real gb/nes rom (i looked at gbdk and decided to not make a real gb game haha)
Interesting mechanic and I totally see the vision for the 2 player competitive version of this, the jumping around to the different trains is pretty interesting and feels it could be mastered/optimized. I felt like I was cheesing it a bit when I would just go through the train to pick up every tool at once before trying to clear a bunch of points. Maybe something like tools disappearing after a certain number of uses (i do like being able to carry multiple things for what tis worth)?
Also i don't know how intentional this was but once I was really cooking and clearing like 4 riders at once all the SFX for the wheels filling up did kind of sound like a train, which felt appropriate!