Kirkby Stephen - The Viaduct Round - The complete circular walk, known as the Viaduct Round, starts at the centre of Kirkby Stephen and incorporates local footpaths, totalling about four miles. The portion along the old railway over the viaducts is easily accessible to walkers, cyclists and horse riders. With graded level surface it allows good access for visitors of all levels of mobility. - from the Northern Viaduct Trust website