One of TrailsWA's Top Trails, this 37 kilometre loop combines the Old Timberline Rail Trail with part of the Sidings Rail Trail. Starting in Nannup and crossing the Blackwood River, the Old Timberline heads along some twisty single track through to the lush Jarrah forest along St Johns Brook and Barrabup Pool before visiting Sleeper Hewer's Hut and returning to Nannup via the Sidings Trail. One of Western Australia's best rail trail experiences