Power Classification	4P reclassified 4MT in 1948
Introduced	1927-1934
Designer	Fowler
Company	LMS
Weight	86t 5cwt
Driving Wheels	5ft 9ins
Boiler Pressure	200psi superheated
Cylinders	Two– 19in x 26in
Tractive Effort	23,125lbf
Valve Gear	Walschaert (piston valve)

The class was introduced by Fowler in 1927 for general passenger train use. They were excellent and popular engines and became the first in a long line of 2-6-4T locomotives to be built.

The 42300 class had parallel boilers whilst all of the later designs had taper boilers. They also had straight tops to the tanks.

The class was originally designed with inside steam pipes, but most of them later were fitted with new cylinders with outside steam pipes.

The last 30 locomotives built (42395-42424) were fitted with side-window cabs.

	Fowler Tank – 42395 onwards of 1933
	Stanier 2 cylinder version – 1935  42425-94 and 42537-672
	Fairburn – 1945  42050-299 and 42673-99
	Riddle – 1951  80000-154

Number in Service.

	Built		Withdrawals	No. in Service
	BR Numbers	Quantity
1927	42300-3	4		4
1928	42304-24	21		25
1929	42325-74	50		75
1930	42375-84	10		85
1931	42385-423	39		124
1932	42424	1		125
1933-58				125
1959			5	120
1960			11	109
1961			22	87
1962			37	50
1963			16	34
1964			20	14
1965			12	2
1966			2	0

Most of the class were used on longer-distance commuter trains from stations in London, Manchester and other large towns. A number were allocated to Oxenholme and Tebay and were used to bank heavy passenger and goods trains up the steep inclines on the West Coast Main Line. Some operated on the long trip from Shrewsbury to Swansea (Victoria).

Allocation of locomotives in service as at 1st of January.

	1948	1960	1964	1966
London Midland Region	92	97	25
North Eastern Region	17	16	9	2
Scottish Region	10
Western Region	6	7
	125	120	34	2
London Midland Region
Alsager	1
Annesley		3
Barrow	5	9	1
Birkenhead			1
Bournville	5
Brunswick		1
Buxton	10	3
Carlisle Kingmoor			2
Carnforth			4
Chester			2
Chester Northgate		3
Crewe North	1
Derby	2	1
Gorton		4	4
Kentish Town	4	5
Leicester Midland	2	2
Longsight	10	6
Macclesfield	9	6
Newton Heath			1
Northampton		1
Northwich		6
Nottingham	3
Oxenholme	4	4
Saltley	2	5	4
Stafford	4	3
St Albans	4	2
Stockport Edgeley	4	7	4
Stoke	8	9	1
Tebay	4	4	1
Trafford Park		1
Uttoxeter	2	2
Watford	2
Wigan	2
Wigan Springs Branch	2
Willesden	2	7
Woodford Halse		3
	92	97	25
North Eastern Region
Copley Hill			1
Darlington			1
Huddersfield	11	6	4	1
Leeds Holbeck		2	1	1
Low Moor	3	1	1
Manningham	2
Mirfield	1	3
Royston		1
Sowerby Bridge		3
Wakefield			1
	17	16	9	2
Scottish Region
Greenock Ladyburn	10
	10
Western Region
Landore		7
Swansea Victoria	6
	6	7
	125	120	34	2

• The North Easter Region Depots had almost all been part of the London Midland Region until September 1956. The exceptions was Copley Hill which was an Eastern Region depot until September 1956.
• Annesley, Gorton and Woodford Halse were under Eastern Region control until it was transferred to the London Midland Region in February.
• Carlisle Kingmoor was a Scottish Region depot until February 1958.
• The last two survivors of the class were withdrawn in 1966. 42394 at Leeds Holbeck in June and 42410 at Huddersfield in September. 42394 had had a nomadic life as it spent many years at Swansea Victoria before moving to Birkenhead in 1962 and then Leeds Holbeck in January 1964. 42410 spent all of its working life based at Huddersfield.

	42394 at Leeds Holbeck a month after it was withdrawn from service in June 1966 and scrapped in October. The Ivatt 2-6-0 43130 lasted until June 1967
	42394 at Leeds Holbeck a month after it was withdrawn from service in June 1966 and scrapped in October. The Ivatt 2-6-0 43130 lasted until June 1967

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• 42424

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