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in 1886
it was a railroad \
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It was completed in 1869 (begun about 1865, but that's not exact).
The tracks of the eastern and western parts of the first transcontinental railroad in the United States were joined on may 10 1869.
The Transcontinental Railroad connected the east coast of the United States with the west coast. Previous to the completion of the railroad the only way to cover the distance was on horseback which could take several months.
It is often argued that the transcontinental railroad increased the national GNP, but an economic study shows that the GNP would have remained the same without the railroad, but it would have been concentrated in the East.
When the First Tanscontinental railroad was built, all the smoke came to where the Native Americans lived. They called the train the 'Iron Horse".
It took 6 years to build the transcontinental railroad.
nitroglycerin was used to make parallel lines to build the railroad