The GER Class T18 was a class of fifty 0-6-0T steam locomotives designed by James Holden for the Great Eastern Railway.

They passed to the London and North Eastern Railway at the grouping in 1923 and received the LNER classification J66.

coupled wheels and a grate area of 12.4 sq ft (1.15 m2).

[1] Withdrawals started in 1936 when four (7278, 7287, 7303 and 7308) were sold to Sir Robert McAlpine and Son, the latter concern also having five on loan from late 1936 to mid-1938.

By the end of 1940, thirty-one had been withdrawn, and the remaining 19 locomotives continued with no further retirements until 1950.