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Great Western Railway No. 111 “The Great Bear”
Although the GWR had concentrated on the 4-6-0 wheel arrangement for high-value traffic since the turn of the century and the Star class seemed to be sufficient for express traffic for a long time, George Jackson Chur...
General
| Property | Great Western Railway No. 111 “The Great Bear”Remove |
|---|---|
| Built | 1908 |
| Manufacturers | Swindon |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Great Western Railway No. 111 “The Great Bear”Remove |
|---|---|
| Length | 21.69 m |
| Wheelbase | 10.52 m |
| Rigid wheelbase | 4.27 m |
| Total wheelbase | 18.61 m |
| Service weight | 98.8 t |
| Adhesive weight | 62.3 t |
| Axle load | 20.8 t |
| Total weight | 145.3 t |
| Water capacity | 15,910 l |
| Fuel capacity | 6.1 t (coal) |
Boiler
| Property | Great Western Railway No. 111 “The Great Bear”Remove |
|---|---|
| Grate area | 3.882 m² |
| Firebox surface | 14.693 m² |
| Tube heating surface | 248.687 m² |
| Evaporative heating surface | 263.38 m² |
| Superheater surface | 50.632 m² |
| Total heating surface | 314.0 m² |
Power plant
| Property | Great Western Railway No. 111 “The Great Bear”Remove |
|---|---|
| Driver diameter | 2,045 mm |
| Boiler pressure | 15.5 bar |
| Expansion type | simple expansion |
| Cylinders | four, 381 x 660 mm |
Power
| Property | Great Western Railway No. 111 “The Great Bear”Remove |
|---|---|
| Power source | steam |
| Estimated power | 1,268 kW (1,724 PS) |
| Starting effort | 123.6 kN |
Calculated values
| Property | Great Western Railway No. 111 “The Great Bear”Remove |
|---|---|
| Factor of adhesion | 1 : 4.95 |
| Optimal speed | 63 km/h |
| Power-to-weight ratio | 12.8 kW/t |
| Heating Surface Equivalent | 438.1 m² |
| Cylinder volume/HSE | 1 : 687.42 |
| Adhesive weight/Total | 1 : 1.59 |
| Tractive force/Heating surface | 1 : 8.22 |
| Grate area/Heating surface | 1 : 80.89 |
| Firebox/Tube surface | 1 : 16.93 |
| Total/Superheater | 1 : 5.20 |
