NER Class 3CC
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The NER Class 3CC (LNER Class D19) was a 4-4-0 steam locomotive designed by Wilson Worsdell for the North Eastern Railway and built in 1893. Only one was built (number 1619) and it was a compound expansion version of the simple expansion NER Class M1. The 3CC was originally classified M but was re-classified 3CC in 1914, at the same time as the M1 was re-classified M.
Number 1619 was built as a Worsdell-von Borries compound with two inside cylinders. In 1898, it was rebuilt as a three-cylinder compound with one inside high-pressure cylinder and two outside low-pressure cylinders, as a test-bed for the development of Walter Mackersie Smith's ideas.
Aside from its compound expansion, the 3CC was similar to several other NER classes and they are summarised here:
|Original NER class||1914 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 (new)||—||—||HP (1) 20″ x 26″
LP (1) 28″ x 26″
|M (1898)||3CC||D19||HP (1) 19″ x 26″
LP (2) 20″ x 26″
- HP = high pressure cylinder, LP = low pressure cylinders
Number 1619 was a one-off but W. M. Smith went on to develop a four-cylinder compound system in the NER Class 4CC (LNER Class C8) 4-4-2 locomotive. Number 1619 was withdrawn in 1930 and was not preserved.
Smith's three-cylinder compound system was also used in the Great Central Railway classes 8D and 8E (LNER Class C5) 4-4-2s and achieved its greatest success in the Midland Railway 1000 Class and the LMS Compound 4-4-0. The Great Northern Railway (Ireland)'s class V was also a Smith compound.
- Baxter, Bertram (1986). Baxter, David, ed. British Locomotive Catalogue 1825–1923, Volume 5A: North Eastern Railway, Hull and Barnsely Railway. Ashbourne, Derbyshire: Moorland Publishing. pp. 166–167. ISBN 0-903485-54-0.
- LNER Encyclopedia
- Steffan, Hans (April 1915). "Neuere Englische Driezylinder-Verbundlokomotiven". Die Lokomotive (in German). Vienna: 75–80.