it started in 1780 and ended in 1862
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Even if there wasn't an underground railroad slavery would have ended without it due to the Civil War. The underground railroad was just a way for slaves to escape and make it to the north it did not end slavery.
Union and Central Pasific Railroad actually met in Promontory, Utah, on May 10 1869 to create the first Transcontinental Railroad.
Allentown Railroad ended in 1945.
Florida Railroad ended in 1872.
Georgia Railroad ended in 1835.
Pontchartrain Railroad ended in 1935.
Philipsburg Railroad ended in 1909.
Patterson Railroad ended in 1872.
Clinchfield Railroad ended in 1983.
Naugatuck Railroad ended in 1906.
Babylon Railroad ended in 1920.