The engineers, unfortunately, didn't take into account the difficulty of reading the bullet from a distance. When an R160 pulls in and I'm at the end of the platform, I can't see what train it is until it's two-thirds down the length of the platform. Suppose I need to make a quick decision depending on the train that's coming, I cannot do that until the train is pretty much in my face.
The trains need larger bullets, and/or The bullets need to stop using the "outline" style; in other words, a solid circle instead of a hollow circle will improve readability a lot.