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The London, Midland and Scottish Railway Compound 4-4-0 was a class of steam locomotive designed for passenger work.[1]

LMS 4P Compound 4-4-0
LMS 1115 circa 1925–1928
Type and origin Power type Steam Builder LMS Derby (75) LMS Horwich (20); North British Locomotive Company (25) Vulcan Foundry (75) Build date 1924–1932 Total produced 195
Specifications Configuration: ​  • Whyte 4-4-0  • UIC 2′B h3v Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Leading dia. 3 ft 6+1⁄2 in (1.080 m) Driver dia. 6 ft 9 in (2.057 m) Wheelbase Loco: 24 ft 3 in (7.391 m) Length 56 ft 7+7⁄8 in (17.269 m) Loco weight 61.70 long tons (62.69 t; 69.10 short tons) Tender weight 41.2–41.7 long tons (41.9–42.4 t; 46.1–46.7 short tons) Fuel type Coal Fuel capacity 4.0–5.5 long tons (4.1–5.6 t; 4.5–6.2 short tons) Water cap. 3,500 imp gal (15,900 l; 4,200 US gal) Firebox:  • Firegrate area 28.5 sq ft (2.65 m2) Boiler G9AS Boiler pressure 200 lbf/in2 (1.38 MPa) Heating surface:  • Tubes and flues 1,170 sq ft (109 m2)  • Firebox 147 sq ft (13.7 m2) Superheater: ​  • Heating area 290 sq ft (26.9 m2) or 272 sq ft (25.3 m2) Cylinders One high pressure (inside) Two low pressure (outside) High-pressure cylinder 19 in × 26 in (483 mm × 660 mm) Low-pressure cylinder 21 in × 26 in (533 mm × 660 mm) Valve gear Stephenson Valve type HP: piston valves LP: Slide valves Train brakes Vacuum
Performance figures Tractive effort 22,650 lbf (100.75 kN)
Career Operators London, Midland and Scottish Railway British Railways Power class 4P Numbers LMS 900–939, 1045–1199 BR: 40900-40939, 41045–41199 Withdrawn 1952–1961 Disposition All scrapped

Overview

One hundred and ninety five engines were built by the LMS, adding to the 45 Midland Railway 1000 Class, to which they were almost identical. The most obvious difference is that the driving wheel diameter was reduced from 7 ft 0 in (2.134 m) on the Midland locomotive to 6 ft 9 in (2.057 m) on the LMS version. They were given the power classification 4P.

The LMS continued the Midland numbering from 1045 to 1199 and then started in the lower block of 900–939. After nationalisation in 1948, BR added 40000 to their numbers so they became 40900–40939 and 41045–41199.[2]

Table of orders

LMS No.	BR No.	Lot No.	Date built	Built by	Notes
1045–1084	41045–41084	6	1924	Derby Works
1085–1114	41085–41114	16	1925	Derby Works
1115–1130	41115–41130	17	1925	Horwich Works
1131–1134	41131–41134	17	1926	Horwich Works
1135–1159	41135–41159	18	1925	North British Loco 23229–53
1160–1184	41160–41184	19	1925	Vulcan Foundry 3833–3857
1185–1199	41185–41199	38	1927	Vulcan Foundry 3998–4012
900–909	40900–40909	38	1927	Vulcan Foundry 4013–4022
910–924	40910–40924	38	1927	Vulcan Foundry 4033–4047
925–934	40925–40934	38	1927	Vulcan Foundry 4023–4032
935–939	40935–40939	90	1932	Derby Works	40936[2]

Accidents and incidents

• On 8 January 1929, locomotive 1060 was hauling an express passenger train from Bristol to Leeds, Yorkshire when it overran signals at Ashchurch, Gloucestershire and collided with a freight train that was being shunted. Four people were killed.[3][4]
• On 13 March 1935, locomotive No. 1165 was hauling a milk train that was in a rear-end collision with an express freight train at King's Langley, Hertfordshire due to a signalman's error. Two other freight trains collided with the wreckage, one person was killed.[5]

Withdrawal

The class were withdrawn between 1952 and 1961. None have survived into preservation, though the first of the Midland 1000 Class engines has.[6] There is an unconfirmed report that No. 41168 was the subject of an unsuccessful preservation attempt by Dr. Peter Beet.[7]

Table of withdrawals

Year	Quantity in service at start of year	Quantity withdrawn	Locomotive numbers
1952	195	6	40911/18/22, 41109/71/82.
1953	189	13	40905, 41046/52/55–57/92/99, 41125/45/48/78/84.
1954	176	23	40901/14/19/23, 41047/51/54/58/74/80/82/84/87/96, 41110/15/33–34/38–39/41/46/74.
1955	153	37	40903/06/08/12–13/15–16/21/24, 41059/61/67/69–70/72/76/81/91, 41104/07/17/24/26/27/30/35–36/49/54/61/69/75–77/83/88/98.
1956	116	27	40900/02/09–10/17/29/32/38–39, 41050/53/65/79/88/97, 41126/28/31–32/37/42/47/60/66/70/87/91.
1957	89	34	40904/26–27/30/34, 41045/48/64/73/75/77/85/89/98, 41103/05/08/12/16/40/50–51/53/55/72/79–81/85–86/92/94–95/97.
1958	55	36	40920/28/31/33/35/37, 41060/66/68/71/78/83/86/90/93/95, 41102/06/11/13–14/18–19/22/44/52/56/59/63–64/67/89–90/93/96/99.
1959	19	13	40925, 41049/62/94, 41100–01/20–21/23/43/58/65/73.
1960	6	4	40907, 41063, 41157/62.
1961	2	2	40936, 41168.

References

Sources

• Ian Allan ABC of British Railways Locomotives, 1948 Edition, part 3, pp 5–6
• David Hunt, John Jennison and Bob Essery. LMS Locomotive Profiles No. 13: The Standard Compounds ISBN 978-1-905184-811
• Rowledge, J.W.P. (1975). Engines of the LMS built 1923–51. Oxford: Oxford Publishing Company. ISBN 0-902888-59-5.

External links

• Class 4P-A Details at Rail UK

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