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Great Western Railway class 3800 “County”
At the turn of the century the GWR needed powerful express locomotives for the Shrewsbury and Hereford line, where no six-coupled locomotives were allowed. So Churchward designed the County class as a 4-4-0 derivative...
General
| Property | Great Western Railway class 3800 “County” as built |
|---|---|
| Built | 1904-1912 |
| Manufacturers | Swindon |
| Wheel arrangement | 4-4-0 (American) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Great Western Railway class 3800 “County” as built |
|---|---|
| Wheelbase | 7.32 m |
| Rigid wheelbase | 2.59 m |
| Service weight | 58.4 t |
| Adhesive weight | 37.6 t |
| Axle load | 19.1 t |
| Total weight | 99.1 t |
| Water capacity | 15,910 l |
Boiler
| Property | Great Western Railway class 3800 “County” as built |
|---|---|
| Grate area | 1.905 m² |
| Firebox surface | 11.919 m² |
| Tube heating surface | 156.978 m² |
| Evaporative heating surface | 168.898 m² |
| Total heating surface | 168.9 m² |
Power plant
| Property | Great Western Railway class 3800 “County” as built |
|---|---|
| Driver diameter | 2,045 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 457 x 762 mm |
Power
| Property | Great Western Railway class 3800 “County” as built |
|---|---|
| Power source | steam |
| Estimated power | 671 kW (912 PS) |
| Starting effort | 91.3 kN |
Calculated values
| Property | Great Western Railway class 3800 “County” as built |
|---|---|
| Factor of adhesion | 1 : 4.04 |
| Optimal speed | 45 km/h |
| Power-to-weight ratio | 11.5 kW/t |
| Heating Surface Equivalent | 228.5 m² |
| Cylinder volume/HSE | 1 : 1,095.01 |
| Adhesive weight/Total | 1 : 1.55 |
| Tractive force/Heating surface | 1 : 11.29 |
| Grate area/Heating surface | 1 : 88.66 |
| Firebox/Tube surface | 1 : 13.17 |
