http://en.wikipedia.org/wiki/London_and_Port_Stanley_Railway
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I'll give you a hint that'll get you through your classes if you ever decide to work in a steam powerplant. The thing that makes steam so powerful is in the way it's able to expand in volume. The whistles on the Queen Mary attraction at Long Beach CA are rigged up to run on compressed air, and they can be heard about three miles away. When the whistles were run on steam though, they could be heard Twelve to Eighteen miles away.
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