The correct answer to this open question is the following.
Although there are no options attached we can say the following.
The significance that the Underground Railroad had besides helping
slaves escape was that it showed that African American slaves could think for themselves, devise options to come with solutions, and showed that they were capable of creating strategies that were creative to solve problems.
Another significant thing was that the Underground Railroad proved that were people in the North -white and black- who had an affinity with abolitionists and that showed sympathy to pronounce themselves against what was happening in the South.