LMS 3-Cylindered Stanier 2-6-4T

LMS Stanier Class 4P 3-cylinder 2-6-4T

42504 at Stratford, November 1961
Type and origin
Power type Steam
Designer William Stanier
Builder LMS Derby Works
Build date 1934
Total produced 37
Specifications
Configuration 2-6-4T
UIC class 1′C2′ h3tb
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 9 in (1.753 m)
Trailing dia. 3 ft 3 1⁄2 in (1.003 m)
Wheelbase 38 ft 6 in (11.73 m)
Length 47 ft 2 3⁄4 in (14.40 m)
Width 8 ft 11 1⁄2 in (2.73 m)
Height 12 ft 10 1⁄2 in (3.92 m)
Loco weight 92.25 long tons (93.73 t; 103.32 short tons)
Fuel type Coal
Fuel capacity 3.50 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)
Boiler LMS type 4C
Boiler pressure 200 lbf/in2 (1.4 MPa)
Heating surface:
 • Tubes and flues		 1,011 sq ft (93.9 m2)
 • Firebox 137 sq ft (12.7 m2)
Superheater:
 ​
 • Heating area 160 to 154 sq ft (14.9 to 14.3 m2)
Cylinders Three
Cylinder size 16 in × 26 in (406 mm × 660 mm)
Performance figures
Tractive effort 24,598 lbf (109.42 kN)
Career
Operators
Power class
  • LMS: 4P
  • BR: 4MT
Numbers
  • LMS 2500–2536
  • BR 42500–42536
Withdrawn 1960–1962
Disposition One preserved, remainder scrapped

LMS Stanier Class 4P 3-Cylinder 2-6-4T is a class of steam locomotive designed for work over the London, Tilbury and Southend Railway. 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, simpler, 2-cylinder design. In 1941 two of the class had just been released from overhaul from Derby Works at the same time as a Jubilee class 4-6-0 failed in Derby station. The two tanks took over and got the train into St Pancras only 25 minutes late.

Production

No. 2500 was the first of the 37 express passenger tank locomotives designed specifically for the London Tilbury and Southend line of the London Midland & Scottish railway (LMS) as they were too powerful for mixed-traffic work. It was built in 1934 at LMS Crewe 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The class were withdrawn from 1960 to 1962.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
Year Quantity in
service at
start of year 		Quantity
withdrawn 		Locomotive numbers
1960 37 1 42512.
1961 36 7 42506/07/10/21/24/31/34.
1962 29 29 42500–05/08/09/11/13–20/22/23/25–30/32/33/35/36.

Preservation

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

No. 2500 has survived and is on display at the National Railway Museum's Shildon Locomotion Museum. It is the sole survivor of this class and is painted in LMS lined black livery.

In fiction

References

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