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Great Western Railway class 2221 “County Tank”
As a successor to the fast suburban class 3600 “Birdcage”, Churchward developed a tank locomotive from the class 3800 “County” by adding a trailing axle and storing water and coal supplies on the locomotive. It used t...
| Great Western Railway class 2221 “County Tank”Remove | |
|---|---|
| Variant | superheated |
| Built | 1912 |
| Manufacturers | Swindon |
| Wheel arrangement | 2B1 t |
| Gauge | 1435 mm |
| Length | |
| Service mass | 72901 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Great Western Railway class 2221 “County Tank”superheated |
|---|---|
| Built | 1912 |
| Manufacturers | Swindon |
| Wheel arrangement | 4-4-2T (Atlantic) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Great Western Railway class 2221 “County Tank”superheated |
|---|---|
| Wheelbase | 9.75 m |
| Service mass | 72.9 t |
| Adhesion mass | 37.6 t |
| Rigid wheelbase | 2.59 m |
| Axle load | 19.3 t |
| Water capacity | 9,093 l |
| Fuel capacity | 3 t (coal) |
Boiler
| Property | Great Western Railway class 2221 “County Tank”superheated |
|---|---|
| Grate area | 1.891 m² |
| Firebox surface | 11.319 m² |
| Tube heating surface | 106.389 m² |
| Evaporative heating surface | 117.708 m² |
| Superheater surface | 7.711 m² |
| Total heating surface | 125.4 m² |
Power plant
| Property | Great Western Railway class 2221 “County Tank”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 2221 “County Tank”superheated |
|---|---|
| Power source | steam |
| Estimated power | 764 kW (1,039 PS) |
| Starting effort | 91.3 kN |
Calculated values
| Property | Great Western Railway class 2221 “County Tank”superheated |
|---|---|
| Factor of adhesion | 1 : 4.04 |
| Optimal speed | 51 km/h |
| Power-to-weight ratio | 10.5 kW/t |
| Heating Surface Equivalent | 189.7 m² |
| Cylinder volume/HSE | 1 : 1,318.75 |
| Adhesive weight/Total | 1 : 1.94 |
| Tractive force/Heating surface | 1 : 15.21 |
| Grate area/Heating surface | 1 : 66.32 |
| Firebox/Tube surface | 1 : 9.40 |
| Total/Superheater | 1 : 15.26 |
