LMS Garratt
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| Type and origin | |
|---|---|
| Power type | Steam |
| Builder | Beyer, Peacock & Co. |
| Serial number | 6325–6327, 6648–6677 |
| Build date | 1927 (3), 1930 (30) |
| Total produced | 33 |
| Specifications | |
|---|---|
| Configuration | 2-6-0+0-6-2 |
| UIC class | (1′C)(C1′) h4t |
| 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) |
| Wheelbase | 79 ft (24.08 m) |
| Length | 87 ft 10 1⁄2 in (26.78 m) |
| Loco weight |
|
| Fuel type | Coal |
| Fuel capacity |
|
| Water cap | 4,500 imp gal (20,000 l; 5,400 US gal) |
| Firebox: • Firegrate area |
44.5 sq ft (4.13 m2) |
| Boiler | LMS type Garratt |
| Boiler pressure | 190 lbf/in2 (1.31 MPa) |
| Heating surface: • Tubes and flues |
1,954 sq ft (181.5 m2) |
| • Firebox | 183 sq ft (17.0 m2) |
| Superheater: |
|
| • Heating area | 500 sq ft (46 m2) or 466 sq ft (43.3 m2) |
| Cylinders | Four, outside |
| Cylinder size | 18 1⁄2 in × 26 in (470 mm × 660 mm) |
| Valve gear | Walschaerts |
| Valve type | Piston valves |
| Performance figures | |
|---|---|
| Tractive effort | 45,620 lbf (202.9 kN) |
| Career | |
|---|---|
| Operators | |
| Class | Garratt |
| Power class | Not classified |
| Withdrawn | 1955–1958 |
| Disposition | All scrapped |
The London Midland and Scottish Railway (LMS) Garratt was a class of Garratt 2-6-0+0-6-2 steam locomotive designed for heavy freight. A total of 33 were built from 1927, making them the most numerous class of Garratt in Britain.
After Grouping the LMS continued the Midland Railway's "small engine policy" of hauling trains using two or three locomotives of moderate power coupled together. This led to most of the Toton (Nottinghamshire)-Brent (London) coal trains being double-headed by 0-6-0 locomotives. It was realised that double heading was uneconomical so a Garratt locomotive was ordered from Beyer, Peacock and Company. However the LMS Derby design office insisted on the fitting of their standard axleboxes to the design. These axleboxes were barely adequate for the LMS Class 4F 0-6-0 locomotives, on which they frequently overheated, and were a major weakness on the LMS Garratts. They were also always heavy on coal and maintenance.
Three locomotives were built in April 1927 and the remaining 30 were built in the period August to November 1930. All were built with straight sided bunkers but from 1931 all except the first two of the 1927 trio were fitted with revolving coal bunkers. These were conical in shape and were revolved and oscillated by means of a small 2-cylinder steam engine. The revolving bunkers prevented coal dust from entering the cab and the oscillation facility made them self-trimming.
The 1927 trio were numbered 4997–4999, and the 1930 batch from 4967 to 4996. They were later renumbered 7967–7999 in the same order to make way for the new Black 5’s . British Railways added 40000 to their numbers.
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Wikipedia