The NER Class O (LNER Class G5) was a class of 0-4-4T steam locomotives of the North Eastern Railway,[1][2] designed by the company's Chief Engineer, Wilson Worsdell.

[2] They all survived into British Railways ownership in 1948 and their BR numbers were 67240-67349.

67338 was used for a series of tests into the performance of concrete sleepers when trains were derailed.

These tests took place between Halifax and Keighley, Yorkshire.

Bachmann Branchline have made a OO gauge model of the NER O class.