LMS 3-Cylindered Stanier 2-6-4T

The LMS Stanier Class 4P 3-Cylinder 2-6-4T is a class of steam locomotives designed for work over the London, Tilbury and Southend Railway route. All 37 were built in 1934 at Derby Works and were numbered 2500–2536. The third cylinder was provided to allow increased acceleration between the many stops on the L.T.&S.R. line. From 1935 the LMS switched to constructing a very similar, albeit simpler, 2-cylinder design.

LMS Stanier Class 4P 3-cylinder 2-6-4T
42504 at Stratford, November 1961
Type and origin
Power typeSteam
DesignerWilliam Stanier
BuilderLMS Derby Works
Build date1934
Total produced37
Specifications
Configuration:
​
 • Whyte2-6-4T
 • UIC1′C2′ h3tb
Gauge4 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 9 in (1.753 m)
Trailing dia.3 ft 3+1⁄2 in (1.003 m)
Wheelbase38 ft 6 in (11.73 m)
Length47 ft 2+3⁄4 in (14.40 m)
Width8 ft 11+1⁄2 in (2.73 m)
Height12 ft 10+1⁄2 in (3.92 m)
Loco weight92.25 long tons (93.73 t; 103.32 short tons)
Fuel typeCoal
Fuel capacity3.50 long tons (3.56 t; 3.92 short tons)
Water cap.2,000 imp gal (9,100 L; 2,400 US gal)
Firebox:
 • Firegrate area		25 sq ft (2.3 m2)
BoilerLMS type 4C
Boiler pressure200 lbf/in2 (1.4 MPa)
Heating surface:
 • Tubes and flues		1,011 sq ft (93.9 m2)
 • Firebox137 sq ft (12.7 m2)
Superheater:
​
 • Heating area160 to 154 sq ft (14.9 to 14.3 m2)
CylindersThree
Cylinder size16 in × 26 in (406 mm × 660 mm)
Performance figures
Tractive effort24,600 lbf (109.43 kN)
Career
Operators
Power class
  • LMS: 4P
  • BR: 4MT
Numbers
  • LMS 2500–2536
  • BR 42500–42536
Withdrawn1960–1962
DispositionOne preserved, remainder scrapped

Production

The 37 three-cylinder express passenger tank locomotives were designed specifically for the London Tilbury and Southend line of the London Midland & Scottish railway (LMS) where extra power was needed to operate the heavy outer suburban trains to tight schedules. The inside cylinder and valve gear created additional maintenance and was deemed unnecessary for other duties. The locomotives were built in 1934 at LMS Derby Works.

Table of orders
numbers Lot No. date built Built at
LMS BR
2500–04 42500–04 102 1934 Derby
2505–36 42505–36 116 1934 Derby

Withdrawal

The class were withdrawn from 1960 to 1962.

Table of withdrawals
YearQuantity in
service at
start of year		Quantity
withdrawn		Locomotive numbers
196037142512.
196136742506–07/10/21/24/31/34.
1962292942500–05/08–09/11/13–20/22–23/25–30/32–33/35–36.

Preservation
LMS 2500 displayed at the National Railway Museum, York, April 2013

The first member of the class to be built, No. 2500 has survived and is on static display at the National Railway Museum in York. It is the sole survivor of this class and is painted in LMS lined black livery.

References
    • Rowledge, J.W.P. (1975). Engines of the LMS built 1923–51. Oxford: Oxford Publishing Company. ISBN 0-902888-59-5.
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