The Great Northern Railway Class H2 and H3 (classified K1 and K2 by the LNER) was a class of 2-6-0 steam locomotive designed for mixed-traffic work. The class was created as a locomotive which could haul heavier goods trains at speeds of up to 40 mph.

Six men held this post during the existence of the Great Northern Railway. Until 1868 engines were obtained from outside manufacturers, but after this date were increasingly built at the railway's own Doncaster Works, commonly known as the "Plant". Some engines acquired second-hand or from absorbed companies have been omitted from these lists.

The Great Northern Railway class H2 and H3 (classified K1 and K2 by the LNER) was a class of 2-6-0 steam locomotive designed for mixed-traffic work. The class was created as a locomotive which could haul heavier goods trains at speeds of up to 40 mph.

The resulting GNR Class H2 (LNER Class K1) was also the first design to incorporate Gresley 's patented double swing link pony truck design. Intended to equalise the weight on the truck's wheels when running on curves, this design would be used for all Gresley designs which incorporated pony trucks.

The London, Brighton and South Coast Railway H2 class is a class of 4-4-2 steam locomotives for express passenger work. They were designed when D. E. Marsh was officially Locomotive Superintendent, and were built at Brighton Works in 1911 and 1912.

As presented in the contemporary press, its 303 sq ft (28.15 sq m) is quite a bit bigger than typical British locomotive practice. Marsden's figure of 230 sq ft, which Locobase adopts, seems much more in line.

Gresley Class H2 2-6-0. 10 engines built with 4′-8″ diam. boilers (LNER K1), rebuilt later with 5′-6″ diam. boilers GNR H3 (LNER K2). Gresley Class H3 2-6-0. 65 engines built with 5′-6″ diam. boilers (LNER K2). The majority of the boiler changes took place at Cowlairs instead of Doncaster. These are denoted by the suffix C after the date.

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Preface to The Locomotives of The Great Northern Railway 1847-1910. I n presenting a history of the various types of locomotives which have been constructed for the Great Northern Railway, the compiler is aware of many deficiencies in the work.

H2 class introduced on the LBSCR by in 1911 which was a superheated development of the H1. One remained in service until 1958. Ivatt strongly believed that a locomotive’s success depended on its capacity to boil water, hence he gave the C1s a large (for the time) boiler and firebox.