Following the old Fernley and Lassen branch line of the Southern Pacific Railroad, the trail winds 25.4 miles from the Susanville Railroad Depot to the Mason Station trailhead north of Westwood.
Most of the trail runs through the rugged Susan River Canyon with its beautiful views of the surrounding mountains and reminders of the railroad logging days of the past. Horseback riders, hikers, joggers, and mountain bicyclists use the trail. In snowy winter months, cross-country skiers and snowmobilers use the upper reaches.
