NER Class S3 / LNER B16 4-6-0

The NER Class S3, classified LNER B16 from 1923, was a fleet of 70 three-cylinder 4-6-0 mixed-traffic steam locomotives designed by Sir Vincent Raven for the North Eastern Railway. Built at Darlington Works between 1919 and 1924, the class was the standard NER and LNER North Eastern Region mixed-traffic engine for over forty years, working secondary expresses and heavy fitted freight across the eastern half of the LNER system. One example, 825, has survived as part of the National Collection at the Locomotion museum at Shildon.

Raven became chief mechanical engineer of the NER in 1910, succeeding Wilson Worsdell. Raven was an early enthusiast for three-cylinder design, believing that the smoother running and better balance gave a useful advantage on heavy mixed-traffic work. The B16 was Raven's mixed-traffic 4-6-0, designed in 1919 as a more powerful development of the earlier S2 class. 70 engines were built at Darlington between 1919 and 1924, and the design was the NER's standard mixed-traffic 4-6-0 for the rest of its working life.

The class was concentrated on the NER and (later) LNER North Eastern Region: York, Heaton, Gateshead, Hull Dairycoates, Darlington, and Scarborough. They worked secondary expresses on the East Coast main line, the cross-country services from Hull and York to the south, and the heavy fitted freight services that complemented the Q6 mineral work. Withdrawals began in the late 1950s as the LNER's newer Pacifics and the BR Standard 5MT 4-6-0s displaced the older 4-6-0s.

The preserved 825 was built at Darlington Works in 1919 as the prototype of the class. After withdrawal in 1962 from York depot, it was selected for the National Collection on the recommendation of the LNER's preservation policy. It is currently displayed at the Locomotion museum at Shildon, in static display condition, and is the only preserved NER three-cylinder 4-6-0 in any form. Together with the preserved Q6 63395 and Q7 63460, the B16 825 forms part of the small but important collection of preserved Raven-era NER locomotives that document the heavy three-cylinder engineering of the North Eastern at its peak.