| GCR Classes 8K and 8M |
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No. 3758 at Whitemoor Depot |
| Type and origin |
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| Power type | Steam |
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| Designer | John G. Robinson |
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| Builder | |
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| Build date | 1911–1914 |
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| Total produced | - 8K: 126
- 8M: 19
- ROD 2-8-0: 521
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| Specifications |
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Configuration:
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| • Whyte | 2-8-0 |
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| • UIC | 1′D h2 |
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| Gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
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| Leading dia. | 3 ft 6 in (1,067 mm) |
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| Driver dia. | 4 ft 8 in (1,422 mm) |
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| Tender wheels | 4 ft 4 in (1,321 mm) |
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| Wheelbase | 51 ft 2.5 in (15.608 m) |
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| • Engine | 25 ft 5 in (7.75 m) |
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| • Tender | 13 ft (4.0 m) |
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| Length | 61 ft 8.5 in (18.809 m) |
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| Loco weight | 72.5–74.65 long tons (73.66–75.85 t; 81.20–83.61 short tons) |
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| Fuel type | Coal |
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| Fuel capacity | 6 long tons 0 cwt (13,400 lb or 6.1 t) |
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| Water cap. | 4,000 imp gal (18,000 L; 4,800 US gal) |
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| Firebox: | |
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| • Type | Belpaire (some engines were fitted with round top fireboxes when the GCR was grouped into the LNER) |
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| • Grate area | 26.24 sq ft (2.438 m2) |
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Boiler:
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| • Tube plates | 15 ft (4,600 mm) |
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| Boiler pressure | 180 psi (1.24 MPa) |
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| Heating surface: | |
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| • Firebox | 153 sq ft (14.2 m2) |
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| • Tubes | 1,348 sq ft (125.2 m2) |
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| • Total surface | 1,756 sq ft (163.1 m2) |
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Superheater:
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| • Type | Robinson |
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| • Heating area | 225 sq ft (20.9 m2) |
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| Cylinders | Two, outside |
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| Cylinder size | 21 in × 26 in (533 mm × 660 mm) |
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| Valve gear | Stephenson |
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| Valve type | Piston valves |
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| Career |
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| Operators | |
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| Class | |
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| Power class | BR: 7F |
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| Numbers | LNER (from 1946): 3500–3920
BR: 63570–63920 |
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| Axle load class | LNER/BR: Route Availability 6 |
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| Withdrawn | December 1958 - April 1966 |
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| Disposition | One preserved, remainder scrapped |
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The Great Central Railway (GCR) Class 8K 2-8-0 is a class of steam locomotive designed for heavy freight. Introduced in 1911, and designed by John G. Robinson, 126 were built for the GCR prior to the First World War. Including wartime construction for the British Army ROD and the post-war GCR Class 8M, the class and its derivatives totalled 666 locomotives.
