The Surface Transportation Board (Board or STB) is adopting a final rule amending its regulations related to the National Trails System Act to: (1) Provide that the initial term for Certificates or Notices of Interim Trail Use or Abandonment will be one year (instead of the current 180 days); (2) permit up to three one-year extensions of the initial period if the trail sponsor and the railroad agree; and (3) permit additional one-year extensions if the trail sponsor and the railroad agree and extraordinary circumstances are shown.