Wylam Dilly is the second oldest surviving railway locomotive in the world; it was built circa 1815 by William Hedley and Timothy Hackworth for Christopher Blackett, the owner of Wylam colliery, west of Newcastle upon Tyne. Wylam Dilly was initially designed for and used on the Wylam Waggonway to transport coal. The four driving wheels are connected by a train of spur wheels driven by a central crankshaft.