Context clues are your friends

Ok, I know some T stations are confusing, but I was busking at Park Street on the Green Line platform, and I observed a young couple staring at the map of the lines, and one said to the other, "So where's the Green Line?"

I don't know; I would think the GREEN maps, the GREEN trains, the GREEN poles and the GREEN signage might provide a clue.

The blind woman who asked me how to find the Red Line was doing a better navigational job than those two. All she needed to know was which side of the construction to be on; she knew exactly where she was going otherwise.