Greg Stephens, I followed your link. Which one is you?
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Since we're talking about undergrounds, I would like to pass on a serious tip. I recently read an article in the Sunday paper about hearing damage. Doctors named undergrounds (subways) as one of the worst environments for the ears.

I always carry hearing protection with me, and I have used it on the underground in Paris, Budapest and New York. Can't remember how London sounded.

Well worth thinking about.