| The Great Bear |
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111 The Great Bear in 1908 |
| Type and origin |
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| Power type | Steam |
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| Designer | George Jackson Churchward |
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| Builder | GWR, Swindon Works |
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| Order number | Lot 171 |
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| Serial number | 2279 |
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| Build date | February 1908 |
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| Total produced | 1 |
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| Rebuilder | GWR, Swindon |
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| Rebuild date | 7 January 1924 |
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| Number rebuilt | 1 |
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| Specifications |
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Configuration:
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| • Whyte | 4-6-2 |
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| • UIC | 2'C1'h4 |
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| Gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
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| Leading dia. | 3 ft 2 in (0.965 m) |
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| Driver dia. | 6 ft 8.5 in (2.045 m) |
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| Trailing dia. | 3 ft 8 in (1.118 m) |
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| Wheelbase | 34 ft 6 in (10.52 m) |
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| Length | 71 ft 2.025 in (21.69 m) |
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| Axle load | 20 long tons (20 t; 22 short tons) |
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| Adhesive weight | 60 long tons (61 t; 67 short tons) |
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| Loco weight | 97 long tons (99 t; 109 short tons) |
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| Tender weight | 45.75 long tons (46.48 t; 51.24 short tons) |
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| Total weight | 142.75 long tons (145.04 t; 159.88 short tons) |
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| Tender type | 8 wheel bogie |
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| Fuel type | Coal |
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| Fuel capacity | 6 long tons (6.1 t; 6.7 short tons) |
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| Water cap. | 3,500 US gal (13,000 L; 2,900 imp gal) |
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| Firebox: | |
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| • Grate area | 41.79 sq ft (3.882 m2) |
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| Boiler | GWR Standard No. 6 |
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| Boiler pressure | 225 psi (1.551 MPa) |
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| Heating surface: | |
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| • Firebox | 158.154 sq ft (14.6930 m2) |
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| • Tubes and flues | 2,697.67 sq ft (250.622 m2) |
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| • Total surface | 3,400.81 sq ft (315.946 m2) |
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Superheater:
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| • Type | Swindon No. 1, Field-tube, 3-row |
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| • Heating area | 545 sq ft (50.6 m2) |
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| Cylinders | 4 |
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| Cylinder size | 15 in × 26 in (381 mm × 660 mm) |
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| Performance figures |
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| Tractive effort | 27,800 lbf (124 kN) (at 85% boiler pressure) |
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| Career |
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| Operators | GWR |
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| Class | 111 |
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| Power class | Special |
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| Number in class | 1 |
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| Numbers | 111 |
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| Official name | The Great Bear, renamed Viscount Churchill in 1924 |
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| Axle load class | Red |
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| Locale | Great Western Main Line (Paddington - Bristol) |
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| First run | 4 February 1908 |
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| Retired | (rebuilt 1924) July 1953 |
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| Disposition | Front end reused to build another GWR 4073 Class, rest of the locomotive was scrapped |
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The Great Bear, number 111, was a locomotive of the Great Western Railway. It was the first 4-6-2 (Pacific) locomotive used on a railway in Great Britain, and the only one of its type built by the GWR.
