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).
| This article needs additional citations for verification. (August 2010) |
Quick Facts Type and origin, Power type ...
LMS Ivatt Class 4 |
---|
43001 at Bletchley Station |
Type and origin |
---|
Power type | Steam |
---|
Designer | H.G. Ivatt |
---|
Builder | |
---|
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 |
---|
|
|
Career |
---|
Operators | |
---|
Power class | |
---|
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Withdrawn | 1963–68 |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 |
---|
|
Close
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.