subway:

More on subway from Fact Monster:

• Public Transportation: Subways - Underground Railroads A short history of subterranean transport in America by Dan Shafto The ...
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• The Top Ten: World's Largest Subway Systems - November 26 - December 3 World's Largest Subway Systems (by usage) Rank City Date system ...
• World's Largest Subway Systems - World's Largest Subway Systems (by ridership) City Date system completed Number of riders ...
• Transportation - Transportation On the Road In the Air On (and Under) the Water On the Rails World's Largest ...

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