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Specifications
Specifications
Configuration:;
• Whyte	2-6-2T
• UIC	1′C1′ h2t
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	3 ft 3+1⁄2 in (1.003 m)
Driver dia.	5 ft 3 in (1.600 m)
Trailing dia.	3 ft 3+1⁄2 in (1.003 m)
Wheelbase	33 ft 3 in (10.13 m)
Length	41 ft 11+3⁄4 in (12.80 m)
Loco weight	w/ 6 boiler: 70.75 long tons (71.89 t; 79.24 short tons); w/ 6A boiler: 71.25 long tons (72.39 t; 79.80 short tons); w/ 6B boiler: 72.5 long tons (73.7 t; 81.2 short tons);
Fuel type	Coal
Fuel capacity	3 long tons (3.05 t; 3.36 short tons)
Water cap.	1,500 imp gal (6,800 L; 1,800 US gal)
Firebox:
• Grate area	71–120: 17+1⁄2 sq ft (1.63 m2); Remainder: 19+1⁄4 sq ft (1.79 m2);
Boiler	LMS type 6 (71–144); LMS type 6A (145–209); LMS type 6B (6 off);
Boiler pressure	200 lbf/in2 (1.38 MPa)
Heating surface:
• Firebox	71–120: 104 sq ft (9.7 m2); 121–144: 107 sq ft (9.9 m2); 6A boiler: 107 sq ft (9.9 m2); 6B boiler: 111 sq ft (10.3 m2);
• Tubes and flues	71–120: 775 sq ft (72.0 m2); 121–144: 859 sq ft (79.8 m2); 6A boiler: 939 sq ft (87.2 m2); 6B boiler: 997 sq ft (92.6 m2);
Superheater:;
• Heating area	6 boiler: 73 sq ft (6.8 m2) to 76 sq ft (7.1 m2); 6A boiler: 74 sq ft (6.9 m2) to 80 sq ft (7.4 m2); 6B boiler: 138 sq ft (12.8 m2) to 137 sq ft (12.7 m2);
Cylinders	Two, outside
Cylinder size	17+1⁄2 in × 26 in (444 mm × 660 mm)
Valve gear	Walschaerts
Valve type	piston valves

Type and origin
Type and origin
Power type	Steam
Designer	William Stanier
Builder	LMS Derby Works (114); LMS Crewe Works (25);
Build date	1935–1938
Total produced	139

LMS Stanier Class 3P 2-6-2T
LMS Stanier Class 3P 2-6-2T
	40142 in service at London Cricklewood, June 1960
Power type
Type and origin
Power type	Steam
Designer	William Stanier
Builder	LMS Derby Works (114); LMS Crewe Works (25);
Build date	1935–1938
Total produced	139
Configuration:;
Specifications
Configuration:;
• Whyte	2-6-2T
• UIC	1′C1′ h2t
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	3 ft 3+1⁄2 in (1.003 m)
Driver dia.	5 ft 3 in (1.600 m)
Trailing dia.	3 ft 3+1⁄2 in (1.003 m)
Wheelbase	33 ft 3 in (10.13 m)
Length	41 ft 11+3⁄4 in (12.80 m)
Loco weight	w/ 6 boiler: 70.75 long tons (71.89 t; 79.24 short tons); w/ 6A boiler: 71.25 long tons (72.39 t; 79.80 short tons); w/ 6B boiler: 72.5 long tons (73.7 t; 81.2 short tons);
Fuel type	Coal
Fuel capacity	3 long tons (3.05 t; 3.36 short tons)
Water cap.	1,500 imp gal (6,800 L; 1,800 US gal)
Firebox:
• Grate area	71–120: 17+1⁄2 sq ft (1.63 m2); Remainder: 19+1⁄4 sq ft (1.79 m2);
Boiler	LMS type 6 (71–144); LMS type 6A (145–209); LMS type 6B (6 off);
Boiler pressure	200 lbf/in2 (1.38 MPa)
Heating surface:
• Firebox	71–120: 104 sq ft (9.7 m2); 121–144: 107 sq ft (9.9 m2); 6A boiler: 107 sq ft (9.9 m2); 6B boiler: 111 sq ft (10.3 m2);
• Tubes and flues	71–120: 775 sq ft (72.0 m2); 121–144: 859 sq ft (79.8 m2); 6A boiler: 939 sq ft (87.2 m2); 6B boiler: 997 sq ft (92.6 m2);
Superheater:;
• Heating area	6 boiler: 73 sq ft (6.8 m2) to 76 sq ft (7.1 m2); 6A boiler: 74 sq ft (6.9 m2) to 80 sq ft (7.4 m2); 6B boiler: 138 sq ft (12.8 m2) to 137 sq ft (12.7 m2);
Cylinders	Two, outside
Cylinder size	17+1⁄2 in × 26 in (444 mm × 660 mm)
Valve gear	Walschaerts
Valve type	piston valves
Tractive effort
Performance figures
Tractive effort	21,485 lbf (95.57 kN)
Operators
Career
Operators	London, Midland and Scottish Railway; → British Railways;
Power class	LMS: 3P; BR: 3MT;
Numbers	LMS: 71–209; BR: 40071–40209;
Withdrawn	1959–1962
Disposition	All scrapped

The Stanier Class 3P 2-6-2T was a class of London, Midland and Scottish Railway (LMS) steam locomotive. They were designed by William Stanier based on the earlier LMS Fowler 2-6-2T.

Overview

A taper-boiler versions of Henry Fowler's 1930 design, the general dimensions were the same with some improvements. They were under-boilered and although improved they were always considered to be indifferent performers. In some ways they were inferior to their predecessors. The cab was of Stanier's usual excellent design with the coal bunker built higher than the rear cab windows but angled inwards to avoid them, thus giving good visibility when running bunker first.

The first 2 lots (117 and 126, locomotives 71–144) were built with number 6 domeless boilers but the rest were built with improved 6A boilers with separate top-feed and steam dome. Both types of boilers were later modified to carry Adams ‘Vortex’ blastpipe to improve steaming. These locomotives could always be identified by the larger diameter chimney.

The 139 locomotives were numbered 71–209 by the LMS, and after 1948 BR renumbered them 40071–209. The LMS classified them 3P.

In a final attempt to improve the locomotives, six were rebuilt with larger 6B boilers; these were 169 in 1940, 163 in 1941, 148 and 203 in 1942, and 40142 and 40167 in 1956. The re-boilering was not considered to be cost effective.

They were to be found on various duties – stopping train, suburban passenger routes, branch line, empty stock and banking.

They are generally considered to be the least successful of Stanier's standard designs.

Detail

Numbers		Lot numbers	Date built	Built at
LMS	BR	Lot numbers	Date built	Built at
71–90	40071–90	117	1935	Derby
91–144	40091–144	126	1935	Derby
145–72	40145–72	139	1937	Derby
173–84	40173–84	139	1938	Derby
185–95	40185–95	140	1937	Crewe
196–209	40196–209	140	1938	Crewe

Withdrawals

The class was withdrawn between November 1959 and December 1962, with the last of the large boiler variant (40148) having been withdrawn in September 1962. None were preserved.

Table of withdrawals
Year	Quantity in service at start of year	Quantity withdrawn	Locomotive numbers
1959	139	10	40084/96, 40125/27/39/60/63/69/72, 40204.
1960	129	4	40161, 40502–07.
1961	125	56	40071/74–77/79/81/91–92/94–95/97, 40101–03/07–08/11/15/18/21/23–24/26/29–34/36/40–44/55–56/62/65–68/71/75/78/82–84/92/94–95/99, 40208–09.
1962	69	69	40072–73/78/80/82–83/85–90/93/98–99, 40100/04–06/09–10/12–14/16–17/19–20/22/28/35/37–38/45–48/50–54/57–59/64/70/73–74/76–77/79–81/85–91/93/96–98, 40200–03.

References

Haresnape, Brian (1970). Stanier Locomotives – a pictorial history. Ian Allan.
Longworth, Hugh. British Railway Steam Locomotives 1948-1968. Oxford Publishing Company. ISBN 0-86093-593-0.
Rowledge, J.W.P. (1975). Engines of the LMS built 1923–51. Oxford: Oxford Publishing Company. ISBN 0-902888-59-5.