High Quality Content by WIKIPEDIA articles! 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". 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.

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