The rebuilding started under GER auspices from 1921 and was continued by the London and North Eastern Railway (LNER) after grouping in 1923.

The earlier GER Class F48 were built between 1900 and 1903 and had round-top boilers; there were sixty of them.

[1] A further thirty of the Belpaire boiler type followed to form Class G58.

8200 had been destroyed in a German V-2 rocket explosion at Stratford in November 1944.

[1] It is owned by the National Railway Museum, York, as part of the UK National Collection, but is on loan to the Barrow Hill Roundhouse and Railway Centre.