(based on an article published by Rails-to-Trails Conservancy in the Winter 2021 Edition of their magazine for members, Rails to Trails.)
In 2020, the United States had over 40,000 miles of multi-user trails open for biking, hiking, horseback riding, cross country skiing, etc., and over 24,000 of these miles were on 2200 former railroad right-of-ways.
It all began in Chicago in 1963 when the Chicago Tribune published a reader's letter entitled "Future Footpath" written by May Theilgaard Watts, a naturalist who proposed converting the neglected and unused railroad corridor of the former Chicago, Aurora, and Elgin Railway into a trail. It ran from Chicago to several western suburbs and she proposed that it "preserve the region's tall grass prairie, connect critical garden and ecology centers, and provide a footpath with a separated bikeway for the community." Today it is the 62 mile Illinois Prairie Path, comprised of a stem and four radiating spokes, all of which I have biked numerous times.
- Great Allegheny Passage (Maryland/Pennsylvania)
- Katy Trail State Park (Missouri)
- Fred Marquis Pinellas Trail (Florida)
- Burke-Gilman Trail (Washington)
- Minuteman Commuter Bikeway (Massachusetts)
- Illinois Prairie Path (Illinois)
- Elroy-Sparta State Trail (Wisconsin)
- Bizz Johnson Trail (California)
- W&OD Trail (Virginia)
- Monon Trail (Indiana)
- Silver Comet Trail (Georgia)
- Chief Ladiga Trail (Alabama)
- East Bay Bicycle Path (Rhode Island)
- Pere Marquette Rail-Trail of Michigan
- Little Miami Scenic Trail (Ohio)
- Paul Bunyan State Trail (Minnesota)
- Wabash Trace Nature Trail (Iowa)
- Prairie Spirit Rail Trail State Park (Kansas)
- Springwater Corridor (Oregon)
- High Line (New York)
- George S. Mickelson Trail (South Dakota)
- Prescott Peavine National Recreation Trail and Iron King Trail (Arizona)
- Longleaf Trace (Mississippi)
- Trail of the Coeur d'Alenes and Route of the Hiawatha (Idaho)
- Historic Union Pacific Rail Trail State Park (Utah)
- Island Line Rail Trail (Vermont)
- Greenbrier River Trail (West Virginia)
- Virginia Creeper National Recreation Trail (Virginia)
- Heritage Rail Trail County Park (Pennsylvania) and Torrey C. Brown Rail Trail (Maryland)
- Midtown Greenway (Minnesota)
- Hudson Valley Trail Network (New York)
- Tammany Trace (Louisiana)
- Cardinal Greenway (Indiana)
- Tanglefoot Trail (Mississippi)
- Mon River Rail-Trail System (West Virginia)