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A form of the "Dow Jones Index" has been around since
1884. The original "Dow Dozen" included railroads, but
it soon evolved into the "Transportation Index" made up
of railroads, the most important large companies of the time. The
more famous "Industrial Index" then began, and ulitmately
became the most-watched index in America.
Companies have come and gone over the years, so the
makeup of both the transportation index and the industrials index
has changed constantly. Please check Dow Jones index
for a more in-depth information and listing of every railroad company
that I can find.
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