LMS/BR Class 4 2-6-4T locomotives

The London, Midland and Scottish Railway and British Railways Class 4 2-6-4T was a family of classes of steam locomotives. A grand total of 800 engines were built to five separate designs by four different mechanical engineers, over a period of 29 years. Each new design was a development of the previous one. The LMS gave the whole group the power classification 4P, under BR 4MT. They are therefore grouped as follows:

LMS Nos	BR Nos	Design	Designer	Built	Built by LMS	Built by BR	Total built
2300–2424	42300–42424	Fowler	Henry Fowler	1927–1934	125	0	125
2500–2536	42500–42536	Stanier, 3 cylinder	William Stanier	1934	37	0	37
2425–2494, 2537–2672	42425–42494, 42537–42672	Stanier, 2 cylinder	William Stanier	1935–1943	206	0	206
2187–2299, 2673–2699	42050–42299, 42673–42699	[LMS LMS Fairburn 2-6-4T\|Fairburn 2-6-4T\|Fairburn]	Charles Fairburn	1945–1951	130	147	277
—	80000–80154	BR Standard	Robert Riddles	1951–1956	0	155	155
			Total	1927–1956	498	302	800

Withdrawal

All engines were withdrawn from stock between 1959 and 1967, summarised as follows:

For technical purposes, it is worth splitting the Fairburn tanks into two subclasses; early and late as their weights differ slightly.