During the 1840s, the "Railroad" metaphor first became widely recognized to describe the secret transport of freedom seekers. Even before this terminology arose, informal clandestine networks and safe houses were already well established across regional borders.

Following an escape attempt, Eliza Brodess ran a runaway advertisement in the Cambridge Democrat, offering a reward of $100 each for the return of Minty (Harriet Tubman) and her brothers, Ben and Harry Ross.

Although Tubman and her brothers initially turned back after their first attempt, she resolved to escape again later that year. Traveling entirely on her own through Maryland and Delaware, she successfully reached freedom in Philadelphia.

Between her escape in 1849 and the onset of the Civil War, Tubman made roughly thirteen dangerous return trips into slave territory, guiding an estimated seventy enslaved people northward to freedom without losing a single passenger.

In October 1855, G. A. Lewis sent correspondence to William Still of the Philadelphia Vigilance Committee detailing eleven freedom seekers successfully traveling through Wilmington, documenting the vital logistics of the northern network.

In March 1856, Quaker stationmaster Thomas Garrett wrote letters confirming the safe arrivals of fugitive groups and coordinating their onward travel through Delaware into Pennsylvania and Canada.

In June 1857, Tubman successfully coordinated the rescue of her elderly parents, Benjamin and Rit Ross. Because of the immediate danger in the region, they were brought to safety and relocated to Rochester, New York.

The outbreak of the American Civil War marked the conclusion of Tubman's covert civilian rescue missions along the Underground Railroad, opening a new chapter of service as a scout, nurse, and spy for the Union Army.