The NER Class C1, was a class of 0-6-0 freight locomotives designed by T.W. Worsdell. They were used throughout the NER system, although particularly in Teesside between 1886 and 1962.

Thirty examples were built at Gateshead between 1886 and 1894, but after 1900 171 examples of the similar Class C compound locomotives were converted to simple operation and added to the class. The whole class was then re-designated as Class C and were numbered between 16 and 1820.

All 201 of the class passed into LNER ownership in 1923, and they were classified J21 but without any sub-classes to reflect the different backgrounds or dimensions. The class retained their original NER numbers under the 1924 renumbering scheme.

Withdrawal of the class began in 1929 but proceeded relatively slowly and there were still substantial numbers in service in 1943 when the survivors were renumbered between 5025 and 5123 (with gaps). Eighty-two surviving examples passed into BR ownership in 1948. These were gradually withdrawn from service over the next fourteen years.

One example, (then numbered 876) was withdrawn in November 1939, but as a result of the onset of war was subsequently repaired and re-instated. It survived as BR 65033 until 1962. The locomotive was then purchased in 1972 for use at the newly established Beamish Museum. 65099 was also a candidate for preservation, but was scrapped.