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来源: biggu 于 2009-09-11 09:53:00 [] [旧帖] [给我悄悄话] 阅读数 : (188 bytes)

http://en.wikipedia.org/wiki/Rail_transport_in_the_United_States

As of 2006, U.S. freight railroads operated 140,490 route-miles (226,097 km) of standard gauge in the United States.

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