1. underground railroad - Noun
2. Underground railroad - Proper noun
secret aid to escaping slaves that was provided by abolitionists in the years before the American Civil War
Source: WordNetI was the conductor of the Underground Railroad for eight years, and I can say what most conductors can't say; I never ran my train off the track and I never lost a passenger. Harriet Tubman
I was the most famous conductor on the Underground Railroad. Harriet Tubman
Before the Civil War, Canada was at the top of the underground railroad. If you made it into Canada, you were safe unless someone came and hauled you back. That was also true during the Vietnam War for draft resisters. Margaret Atwood
Buffalo was a terminus point of the Underground Railroad with many fugitive slaves crossing the Niagara River to Fort Erie, Ontario in search of freedom. citation During the 1840s, Buffalo's port continued to develop. Source: Internet
Charles T. Webber’s The Underground Railroad has illustrated books, magazines, and encyclopedias by the score, and yet it took decades for the museum to accept the painting. Source: Internet
Completely refurbished, this mansion was once part of the Underground Railroad and today houses 16 period rooms, a railroad museum, West Des Moines community history, and a museum dedicated to the Underground Railroad in Iowa. Source: Internet