Wallthwaite Viaduct on the disused railway between Penrith and Keswick in the Lake District, Cumbria Les Bell October 17, 2018 2018, Bridges, Cumbria, Keswick, Lake District, Railways, Viaducts Wallthwaite Viaduct on the disused railway between Penrith and Keswick in the Lake District, Cumbria.