| Power Classification | |
| Introduced | 1822 or 1857 |
| Designer | George Stephenson & Nicholas Wood |
| Company | Hetton Colliery |
| Weight | 9t 15cwt |
| Driving Wheels | 3ft 0ins |
| Boiler Pressure | 80psi |
| Cylinders | 10¼in x 24in |
| Tractive Effort | |
| Valve Gear |
Incorporating ‘Locomotion’ type technology this locomotive was popularly assumed/claimed to have been built in 1822 by George Stephenson and Nicholas Wood, which is coincident with the completion of the Hetton Railway. This was however disputed as it may have been built or significantly rebuilt from an earlier locomotive in 1857 at the behest of Sir Lindsay Wood, son of Nicholas Wood. The engineer thought to have undertaken this task was called Young. See 2019 and 2020 updates below.
It was withdrawn in 1912 and also ran at the 1925 Stockton and Darlington Railway centenary.
It was one of the engines built to work the eight mile line between the colliery and the coal staithes on the River Wear.
It was rebuilt in 1882 when it acquired new frames and boiler.
It was withdrawn from service in 1912.
In 1925 it was steamed to head the procession of engines at the Darlinton Centenary Exhibition.
This locomotive was exhibited in the LNER Queen Street Railway Museum in York from its opening in 1927. It was stored at Reedsmouth during The Second World War.
In 1974 it was loaned to the new Beamish Museum where it was initially displayed in the Colliery and latterly at the Waggonway, together with working replicas of contemporary locomotives.
In 2006 it was moved to the Locomotion museum at Shildon, but returned to Beamish in May 2011 for a period before returning to Shildon.
In April 2019 the National Railway Museum revealed that an archaeological survey of the locomotive was going to be undertaken. They went on to say that despite having been in preservation since the 1920s very little is known about it.
In July 2020 the survey of the history of the locomotive conducted by Dr Michael Bailey MBE and Peter Davidson concluded that the locomotive was built around 1849. It was therefore built a year after Stephenson had died. The locomotive was one of three similar engines built between 1849 and 1854. Lyon was named after John Lyon, on whose estate the Hetton colliery was located.
| Home Base | Current Status | Owner |
| National Railway Museum -Locomotion at Shildon | On static display | National Railway Museum NRM Object Number{1978-7009} |
Preserved British Steam Locomotives 