The Underground Railroad consisted of meeting points, secret routes, transportation, and safe houses and assistance provided by abolitionist sympathizers. Individuals were often organized in small, independent groups; this helped to maintain secrecy because individuals knew some connecting "stations" along the route, but knew few details of their immediate area. Escaped slaves would move north along the route from one way station to the next. Although the fugitives sometimes traveled on boat or train, they usually traveled on foot or by wagon.