Rail trails are "multi-purpose public paths created from abandoned railroad corridors." Such trails are relatively flat and, if carefully planned and well maintained, excellent for bicycling, walking, running, horseback riding, in-line skating, cross-country skiing, and wheelchair recreation. There is a directory of over 1,000 trails listed by U.S. state. For each trail, name, location, length, surface, and contact information are listed. A few trails have individual sites with detailed information.