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LMS Ivatt Class 4
43001 at Bletchley Station
Type and origin
Power type
Steam
Designer
H.G. Ivatt
Builder
LMS/BR Horwich Works (75)
BR Doncaster Works (50)
BR Darlington Works (37)
Build date
1947-1952
Total produced
162
Specifications
Configuration:
• Whyte
2-6-0
• UIC
1′C h2
Gauge
4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.
3 ft 0 in (0.914 m)
Driver dia.
5 ft 3 in (1.600 m)
Length
55 ft 11 in (17.04 m)
Loco weight
59.1 long tons (60.0 t; 66.2 short tons)
Tender weight
40.3 long tons (40.9 t; 45.1 short tons)
Fuel type
Coal
Fuel capacity
4 long tons (4.1 t; 4.5 short tons)
Water cap.
3,500 imp gal (16,000 L; 4,200 US gal)
Firebox:
• Grate area
23 sq ft (2.1 m2)
Boiler
LMS 4D
Boiler pressure
225 lbf/in2 (1.55 MPa)
Heating surface:
• Firebox
131 sq ft (12.2 m2)
• Tubes and flues
1,090 sq ft (101 m2)
Superheater:
• Heating area
231 or 247 sq ft (21.5 or 22.9 m2)
Cylinders
Two, outside
Cylinder size
17+1⁄2 in × 26 in (444 mm × 660 mm)
Valve gear
Walschaerts
Performance figures
Tractive effort
24,170 lbf (107.51 kN)
Career
Operators
London, Midland and Scottish Railway
British Railways
Power class
LMS: 4F, later 4
BR: 4MT
Numbers
LMS: 3000–3009
BR: 43000–43161
Nicknames
Mucky Ducks, Doodlebugs, Flying Pigs
Axle load class
BR: Route Availability 4
Withdrawn
1963–68
Disposition
One preserved, remainder scrapped
The LMS Ivatt Class 4 2-6-0 is a class of steam locomotive primarily designed for medium freight work but also widely used on secondary passenger services.
The London, Midland and Scottish Railway (LMS) ordered 162 of this type between 1947 and 1952, but only three were built by the LMS before nationalisation in 1948. Designed by George Ivatt, they were classified 4F by the LMS and 4MT by British Railways (BR).
In BR days they were used extensively across the system, being prevalent on the London Midland region and to a lesser extent elsewhere, notably on the Midland and Great Northern Joint Railway, an East Anglian line that had previously been joint owned by the LMS and LNER, where they became the dominant locomotive type. They were also used for a short period on the Somerset and Dorset Joint Railway, but were quickly transferred elsewhere, never to return, because of poor steaming on the line's long and steep gradients – this was before modifications were made to the design which improved steaming notably.[1]
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