What railroad improvement was completed in the United States in 1869?

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The transcontinental railroad was completed in 1869, connecting the East Coast of the United States to the West Coast by rail for the first time. This was a major infrastructure project that revolutionized transportation and trade in the United States. The steam engine was actually invented in the early 18th century, and railroads were not nationalized in the United States.

What Railroad Improvement Was Completed in the United States in 1869