Killingworth Colliery (Killingworth Waggonway)

Killingworth Colliery and its associated waggonway north of Newcastle upon Tyne was the practical birthplace of the steam locomotive as a commercially viable machine — the colliery where George Stephenson served as engine-wright from 1812, built his first locomotive in 1814, and developed the sequence of experimental engines that directly preceded the Stockton and Darlington Railway's Locomotion and the Rocket. It was at Killingworth that Stephenson proved, through years of patient practical experiment, that a smooth-wheeled steam locomotive could haul useful loads on smooth iron rails — the fundamental demonstration that made the railway age possible.

Stephenson's first locomotive Blücher of 1814 — named for the Prussian general of the Waterloo campaign — was followed by a succession of improved Killingworth engines that incorporated the lessons of each trial. The key advance was the exhaust steam blast, directing the engine's exhaust through the chimney to create a draught on the fire and dramatically improving steaming — the same principle that made Rocket the decisive winner at Rainhill in 1829. Killingworth Billy, one of the surviving Killingworth locomotives (confirmed in 2017 as a Stephenson-built engine of around 1816), is preserved at the Stephenson Railway Museum at North Shields — the third-oldest surviving steam locomotive in the world after Puffing Billy and Wylam Dilly.

Killingworth Colliery's waggonway thus represents the proving ground from which the entire railway age emerged: the place where Stephenson moved from theory to practice, accumulating the engineering knowledge that he brought to the Stockton and Darlington in 1821 and the Liverpool and Manchester in 1826.