For instance, the Great American Rail Trail is still under construction and will extend around 3,500 miles, making it the longest bike trail in the USA when it's finished!
As trains have fallen out of use, being supplanted by the Interstate system, many of America's railroads have been left abandoned. Efforts are underway across the nation to convert these into recreational rail trails for cycling and hiking. For instance, the Great American Rail Trail is still under construction and will extend around 3,500 miles, making it the longest bike trail in the USA when it's finished!