Lambley Viaduct in Northumberland was opened in 1852 as part of the Alston line, a single track from Haltwhistle. Trains last ran across Lambley Viaduct in the 1970’s, serving the lead mines at Alston. Walkers on the Pennine Way pass nearby but don’t cross the river. The elegant arches span the River South Tyne flowing down from Alston, making it the only major river in Cumbria which flows to the North Sea.