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Great Western Railway Fire Fly class
Daniel Gooch used the Star class, more precisely the “North Star” locomotive developed by Robert Stephenson, as a basis for the design a new broad-gauge express locomotive. He stayed with the 2-2-2 wheel arrangement a...
| Great Western Railway Fire Fly classRemove | |
|---|---|
| Variant | |
| Built | 1840-1842 |
| Manufacturers | Jones, Turner and Evans;Sharp, Roberts & Co.;Fenton, Murray and Jackson;G. and J. Rennie;R. B. Longridge and Company;Stothert, Slaughter & Co.;Nasmyth, Gaskell and Company |
| Wheel arrangement | 1A1 |
| Gauge | 2140 mm |
| Length | |
| Service mass | 24588 kg |
| Top speed | 93 km/h |
| Power | |
| Engine |
General
| Property | Great Western Railway Fire Fly classRemove |
|---|---|
| Built | 1840-1842 |
| Manufacturers | Jones, Turner and Evans, Sharp, Roberts & Co., Fenton, Murray and Jackson, G. and J. Rennie, R. B. Longridge and Company, Stothert, Slaughter & Co., Nasmyth, Gaskell and Company |
| Wheel arrangement | 2-2-2 (Jenny Lind) |
| Gauge | 2,140 mm |
Dimensions and weights
| Property | Great Western Railway Fire Fly classRemove |
|---|---|
| Wheelbase | 4.01 m |
| Total wheelbase | 6.20 m |
| Service mass | 24.6 t |
| Adhesion mass | 11.8 t |
| Rigid wheelbase | 4.01 m |
| Axle load | 11.8 t |
| Water capacity | 8,184 l |
| Fuel capacity | 1.7 t (coal) |
Boiler
| Property | Great Western Railway Fire Fly classRemove |
|---|---|
| Grate area | 1.245 m² |
| Firebox surface | 9.012 m² |
| Tube heating surface | 68.005 m² |
| Evaporative heating surface | 77.017 m² |
| Total heating surface | 77.0 m² |
Power plant
| Property | Great Western Railway Fire Fly classRemove |
|---|---|
| Driver diameter | 2,134 mm |
| Boiler pressure | 3.4 bar |
| Expansion type | simple expansion |
| Cylinders | two, 381 x 457 mm |
Power
| Property | Great Western Railway Fire Fly classRemove |
|---|---|
| Power source | steam |
| Estimated power | 112 kW (152 PS) |
| Top speed | 93 km/h |
| Starting effort | 9.1 kN |
Calculated values
| Property | Great Western Railway Fire Fly classRemove |
|---|---|
| Factor of adhesion | 1 : 12.74 |
| Optimal speed | 76 km/h |
| Power-to-weight ratio | 4.6 kW/t |
| Heating Surface Equivalent | 122.1 m² |
| Cylinder volume/HSE | 1 : 853.97 |
| Adhesive weight/Total | 1 : 2.08 |
| Tractive force/Heating surface | 1 : 2.47 |
| Grate area/Heating surface | 1 : 61.86 |
| Firebox/Tube surface | 1 : 7.55 |
