The Underground Railroad was not a railroad, but an operation made to help get run away slaves to freedom. Most slaves traveled to Canada.
It was 1820 when The term "Underground Railroad" was used. The peak of the Underground was From 1850 to the end of the Civil War (1865).
Harriet Tubman (1820-1913) Was a freed slave who became an Abolitionist. She was born somewhere in 1820 but no one knows for sure since slaves had no birth records. She was one of the most famous Abolitionist freeing more than 300 slaves and took them to Canada.
Frederick Douglass was a male African-American Abolitionist/ Journalist who created a newspaper called "The North Star" and was a major part of the Underground Railroad.
The Underground diminished in 1865 as a result of the Civil War ending slavery.