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TheNER Class G (LNER Class D23) was a class of2-4-0steam locomotives of theNorth Eastern Railway. It was designed byThomas William Worsdell and introduced in 1887.
The engines were built as Class G12-4-0s. They hadsimple expansion cylinders,slide valves, andJoy valve gear. Twenty locomotives were built atDarlington Works in 1887-1888. They were initially classed as "G1" to leave the classification "G" available for acompound version. However, the compound version was not built and they were reclassified as "G" in 1914.[1]
Between 1900 and 1904, they were rebuilt as 4-4-0s. At the same time, they were fitted withpiston valves andStephenson valve gear.Superheaters were fitted between 1913 and 1916.
The engines were initially used for secondary passenger duties. By the time of the 1923Grouping, they were working local passenger services.
Withdrawals took place between 1929 and 1935 and none were preserved.