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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...
General
| Property | Great Northern (UK) class K as built |
|---|---|
| Built | 1901-1909 |
| Manufacturers | Doncaster |
| Wheel arrangement | 0-8-0 (Eight-coupled) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Great Northern (UK) class K as built |
|---|---|
| Wheelbase | 12.60 m |
| Rigid wheelbase | 5.39 m |
| Service weight | 55.5 t |
| Adhesive weight | 55.5 t |
| Axle load | 15.2 t |
| Total weight | 97 t |
Boiler
| Property | Great Northern (UK) class K as built |
|---|---|
| Grate area | 2.276 m² |
| Firebox surface | 12.705 m² |
| Tube heating surface | 120.983 m² |
| Evaporative heating surface | 133.688 m² |
| Total heating surface | 133.7 m² |
Power plant
| Property | Great Northern (UK) class K as built |
|---|---|
| Driver diameter | 1,422 mm |
| Boiler pressure | 12.4 bar |
| Expansion type | simple expansion |
| Cylinders | two, 508 x 660 mm |
Power
| Property | Great Northern (UK) class K as built |
|---|---|
| Power source | steam |
| Estimated power | 597 kW (812 PS) |
| Starting effort | 126.4 kN |
Calculated values
| Property | Great Northern (UK) class K as built |
|---|---|
| Factor of adhesion | 1 : 4.31 |
| Optimal speed | 29 km/h |
| Power-to-weight ratio | 10.8 kW/t |
| Heating Surface Equivalent | 197.2 m² |
| Cylinder volume/HSE | 1 : 1,357.43 |
| Adhesive weight/Total | 1 : 1.00 |
| Tractive force/Heating surface | 1 : 19.75 |
| Grate area/Heating surface | 1 : 58.74 |
| Firebox/Tube surface | 1 : 9.52 |
