These are leisurely rides, typically under 10 mph, with round trips ranging from one to four hours. You may take in mountain views; pass through farmland, forests or fields; or ride by water and across bridges. Rail bikes have semi-recumbent seating, meaning you lean back, with the pedals in front of you. Robert Nichols, co-owner of Joseph Branch Railriders in Oregon, says it’s easier on your joints than riding a bike. Also, riding on steel tracks creates little friction. —Michele Herrmann