NER Class M1
Encyclopedia
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).
) 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:
No D17/1s passed into British Railways ownership. Two D17/2s did (BR numbers 62111 and 62112) but they were withdrawn in February 1948.
North Eastern Railway (UK)
The North Eastern Railway , was an English railway company. It was incorporated in 1854, when four existing companies were combined, and was absorbed into the London and North Eastern Railway at the Grouping in 1923...
Class M1 (LNER Class D17/1) is a class of 4-4-0
4-4-0
Under the Whyte notation for the classification of steam locomotives, 4-4-0 represents the wheel arrangement of four leading wheels on two axles , four powered and coupled driving wheels on two axles, and no trailing wheels...
steam locomotive
Steam locomotive
A steam locomotive is a railway locomotive that produces its power through a steam engine. These locomotives are fueled by burning some combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine...
, designed by Wilson Worsdell
Wilson Worsdell
Wilson Worsdell was a British locomotive engineer who was locomotive superintendent of the North Eastern Railway from 1890 to 1910. He was the younger brother of T.W. Worsdell.-Family:...
. 20 initial engines were built, then 30 further units were built, designated Class Q (LNER Class D17/2).
Classification
Classification is complex. The NER initially classified these locomotives "M1" while a variant (with compound expansionCompound locomotive
A compound engine unit is a type of steam engine where steam is expanded in two or more stages.A typical arrangement for a compound engine is that the steam is first expanded in a high-pressure cylinder, then having given up heat and losing pressure, it exhausts directly into one or more larger...
) was classified "M". The compound was later re-classified "3CC"
NER Class 3CC
The NER Class 3CC was a 4-4-0 steam locomotive designed by Wilson Worsdell for the North Eastern Railway and built in 1893. Only one was built and it was a compound expansion version of the simple expansion NER Class M1...
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:
| Original NER class | New NER class | LNER Class | Cylinders | Driving wheels |
|---|---|---|---|---|
| M1 | M | D17/1 | (2) 19" x 26" | 7' 1¼" |
| Q | - | D17/2 | (2) 19½" x 26" | 7' 1¼" |
| Q1 | - | D18 | (2) 19½" x 26" | 7' 7¼" |
| M | 3CC | D19 | HP (1) 19" x 26" LP (2) 20" x 24" |
7' 1¼" |
- HP = high pressure cylinder, LP = low pressure cylinders
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.