Just finished book 3 and I will say the added railway layout confusion kinda took me out of the story, I would find myself rewinding full descriptions several times and still not understanding. The author took a lot of time to describe the different train lines and all the stations but I just stopped caring because it really didn't matter. Just annoying he took the time to explain everything but it still made no sense.

Book 4 starts way better, with the showrunner explaining the rules and the objectives as soon as they get to the 5th floor.