Compare locomotives
Add a locomotive
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...
| Great Western Railway class 3800 “County”Remove | |
|---|---|
| Variant | superheated |
| Built | 1904-1912 |
| Manufacturers | Swindon |
| Wheel arrangement | 2B |
| Gauge | 1435 mm |
| Length | |
| Service mass | 59744 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Great Western Railway class 3800 “County”superheated |
|---|---|
| Built | 1904-1912 |
| Manufacturers | Swindon |
| Wheel arrangement | 4-4-0 (American) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Great Western Railway class 3800 “County”superheated |
|---|---|
| Wheelbase | 7.32 m |
| Service mass | 59.7 t |
| Adhesion mass | 40.6 t |
| Total mass | 100.4 t |
| Rigid wheelbase | 2.59 m |
| Axle load | 19.4 t |
| Water capacity | 15,910 l |
Boiler
| Property | Great Western Railway class 3800 “County”superheated |
|---|---|
| Grate area | 1.91 m² |
| Firebox surface | 11.958 m² |
| Tube heating surface | 125.352 m² |
| Evaporative heating surface | 137.311 m² |
| Superheater surface | 17.837 m² |
| Total heating surface | 155.1 m² |
Power plant
| Property | Great Western Railway class 3800 “County”superheated |
|---|---|
| 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”superheated |
|---|---|
| Power source | steam |
| Estimated power | 783 kW (1,065 PS) |
| Starting effort | 91.3 kN |
Calculated values
| Property | Great Western Railway class 3800 “County”superheated |
|---|---|
| Factor of adhesion | 1 : 4.37 |
| Optimal speed | 53 km/h |
| Power-to-weight ratio | 13.1 kW/t |
| Heating Surface Equivalent | 232.8 m² |
| Cylinder volume/HSE | 1 : 1,074.86 |
| Adhesive weight/Total | 1 : 1.47 |
| Tractive force/Heating surface | 1 : 12.29 |
| Grate area/Heating surface | 1 : 81.23 |
| Firebox/Tube surface | 1 : 10.48 |
| Total/Superheater | 1 : 7.70 |
