The Palouse to Cascades State Park Trail, formerly known as the John Wayne Pioneer Trail and the Iron Horse Trail, is a rail trail that spans most of the U.S. state of Washington. It follows the former railway roadbed of the Chicago, Milwaukee, St. Paul & Pacific Railroad for 300 miles (480 km) across two-thirds of the state, from the western slopes of the Cascade Mountains to the Idaho border. (Ref: https://en.wikipedia.org/wiki/Palouse_to_Cascades_State_Park_Trail)