The Great Eastern Railway was formed on 1 August 1862, when the Eastern Counties Railway changed its name. The ECR had originally been built to gauge, was converted to in September and October 1844.
In addition to these, there is another locomotive under construction as of 2024:
A replica of GER Class M15 2-4-2T No. 789 (LNER 7789, 7218/BR 67218). It is being built at Tyseley Locomotive Works in Birmingham.