Redirected from Railroads of the United States of America
total: 240,000 km mainline routes (nongovernment owned),
standard gauge (1.435 m) (1989)
See also Transportation in the United States.
... form of iron and carbon, and result from the rapid cooling of austenite during quenching. In the 1890s, Martens studied samples of different steels under a microscope, ...
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