American railroad trackage explodes as coal replaces wood

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• The Underground History of American Education pp. 134-135 · open book

  Trackage grew from 1,100 miles in 1836 to 2,800 miles in 1841 to 5,600 miles in 1845, to 11,000 miles in 1850, to 22,000 miles in 1855, to 44,000 miles in 1860 on the eve of the Civil War.

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