The NER Class W1 was a 4-6-2T 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...

 of the North Eastern Railway

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...

. The class was introduced in 1914 as a rebuild of 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:...

's NER Class W 4-6-0T (introduced 1907). On being acquired by the London and North Eastern Railway

London and North Eastern Railway

The London and North Eastern Railway was the second-largest of the "Big Four" railway companies created by the Railways Act 1921 in Britain...

 in 1923 the W1s were re-classified A6. The information in the infobox (right) is taken from sources.

British Railways

One locomotive was withdrawn in 1947 but the remaining nine passed to British Railways in 1948 and were numbered as follows:

• Superheated: 69791-69793 and 69796-69797
• Non-superheated: 69794-69795 and 69798-69799

This seems to conflict with the claim that seven locomotives were fitted with superheaters but, possibly, the superheater was removed from one locomotive. This might have happened when a boiler was changed.

Withdrawal

One locomotive was withdrawn in 1947 and the others had all been withdrawn by the end of 1951. None is preserved.