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" when the M1 was re-classified "M".
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[edit] Overview
Number 1619 was built as a Worsdell-von Borries compound with two inside cylinders. It later became a test-bed for the development of Walter Mackersie Smith's ideas and, in 1898, it was rebuilt as a three-cylinder compound with one inside high-pressure cylinder and two outside low-pressure cylinders.
[edit] Classification
Aside from its compound expansion, the 3CC was similar to several other NER classes and they are summarised here:
| 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
- This table shows the cylinder dimensions of no. 1619 in 3-cylinder form. The cylinder dimensions in 2-cylinder form are not known
[edit] Legacy
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 Number 1619 was withdrawn in 1930 and was not preserved.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.
[edit] External links
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