The North Eastern Railway Class M1 (LNER Class D17/1) is a class of 4-4-0 steam locomotive, designed by Wilson Worsdell. 20 initial engines were built, then 30 further units were built, designated Class Q (LNER Class D17/2).

Classification

Classification was complex. The NER initially classified these locomotives "M1", while a variant (with compound expansion) was classified "M". The compound was later re-classified "3CC" and the "M1" was re-classified "M". Under LNER ownership the "M" (formerly "M1") became LNER Class D17/1 and the "3CC" (formerly "M") became LNER Class D19. This table summarises LNER classes D17, D18 and D19, which were all very similar:

Accidents and incidents

Withdrawal

The last two D17/1s were withdrawn in 1945. Number 1629 was scrapped but number 1621 was saved for preservation. No D17/1s passed into British Railways ownership. Two D17/2s did (BR numbers 62111 and 62112) but they were withdrawn in February 1948.

Preservation