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Great Northern (UK) class K
To haul heavy coal trains from Peterborough to London, Ivatt developed the class K, which was soon dubbed the “Long Tom” because of its longer boiler compared to the six-coupled locomotives. The dimensions of this boi...
| Great Northern (UK) class KRemove | |
|---|---|
| Variant | rebuilt No. 420 |
| Built | 1914 |
| Manufacturers | Doncaster |
| Wheel arrangement | D |
| Gauge | 1435 mm |
| Length | |
| Service mass | 61420 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Great Northern (UK) class Krebuilt No. 420 |
|---|---|
| Built | 1914 |
| Manufacturers | Doncaster |
| Wheel arrangement | 0-8-0 (Eight-coupled) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Great Northern (UK) class Krebuilt No. 420 |
|---|---|
| Wheelbase | 12.60 m |
| Service mass | 61.4 t |
| Adhesion mass | 61.4 t |
| Total mass | 105.2 t |
| Rigid wheelbase | 5.39 m |
| Axle load | 16.7 t |
| Water capacity | 14,006 l |
| Fuel capacity | 5.6 t (coal) |
Boiler
| Property | Great Northern (UK) class Krebuilt No. 420 |
|---|---|
| Grate area | 2.23 m² |
| Firebox surface | 13.378 m² |
| Tube heating surface | 141.491 m² |
| Evaporative heating surface | 154.87 m² |
| Superheater surface | 37.44 m² |
| Total heating surface | 192.3 m² |
Power plant
| Property | Great Northern (UK) class Krebuilt No. 420 |
|---|---|
| Driver diameter | 1,422 mm |
| Boiler pressure | 11.7 bar |
| Expansion type | simple expansion |
| Cylinders | two, 533 x 660 mm |
Power
| Property | Great Northern (UK) class Krebuilt No. 420 |
|---|---|
| Power source | steam |
| Estimated power | 746 kW (1,014 PS) |
| Starting effort | 131.6 kN |
Calculated values
| Property | Great Northern (UK) class Krebuilt No. 420 |
|---|---|
| Factor of adhesion | 1 : 4.58 |
| Optimal speed | 35 km/h |
| Power-to-weight ratio | 12.1 kW/t |
| Heating Surface Equivalent | 296.6 m² |
| Cylinder volume/HSE | 1 : 994.96 |
| Adhesive weight/Total | 1 : 1.00 |
| Tractive force/Heating surface | 1 : 14.29 |
| Grate area/Heating surface | 1 : 86.24 |
| Firebox/Tube surface | 1 : 10.58 |
| Total/Superheater | 1 : 4.14 |
