@evan yeah, I don't mind it, either. I love living in a city.Ours is close to the surface, and right under the house, so it's always audible … but the brain filters it out, I guess.But last year they did "improvement" work on the line - grinding the rails to keep them smooth, or something - and for many weeks after that I heard screaming steel-on-steel every few min., 18 hrs a day. It was a nightmare. (I'm on the 2nd floor. Pity the basement tenant!)I hope they don't do that again soon!