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Highland Railway classes C “Small Ben” and U “Large Ben”
Starting in 1898, Peter Drummond had eight 4-4-0 locomotives built by Dübs, which were intended for passenger and express service and had inside cylinders. They were named after Scottish mountains, all of which start ...
General
| Property | Highland Railway classes C “Small Ben” and U “Large Ben” U (Large Ben) |
|---|---|
| Built | 1908-1909 |
| Manufacturers | North British |
| Wheel arrangement | 4-4-0 (American) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Highland Railway classes C “Small Ben” and U “Large Ben” U (Large Ben) |
|---|---|
| Wheelbase | 6.78 m |
| Rigid wheelbase | 2.13 m |
| Total wheelbase | 13.45 m |
| Service weight | 53.1 t |
| Adhesive weight | 35.8 t |
| Axle load | 18.1 t |
| Total weight | 93.8 t |
| Water capacity | 12,038 l |
Boiler
| Property | Highland Railway classes C “Small Ben” and U “Large Ben” U (Large Ben) |
|---|---|
| Grate area | 1.886 m² |
| Firebox surface | 12.263 m² |
| Tube heating surface | 140.841 m² |
| Evaporative heating surface | 153.104 m² |
| Total heating surface | 153.1 m² |
Power plant
| Property | Highland Railway classes C “Small Ben” and U “Large Ben” U (Large Ben) |
|---|---|
| Driver diameter | 1,829 mm |
| Boiler pressure | 12.4 bar |
| Expansion type | simple expansion |
| Cylinders | two, 464 x 660 mm |
Power
| Property | Highland Railway classes C “Small Ben” and U “Large Ben” U (Large Ben) |
|---|---|
| Power source | steam |
| Estimated power | 597 kW (812 PS) |
| Starting effort | 81.9 kN |
Calculated values
| Property | Highland Railway classes C “Small Ben” and U “Large Ben” U (Large Ben) |
|---|---|
| Factor of adhesion | 1 : 4.29 |
| Optimal speed | 45 km/h |
| Power-to-weight ratio | 11.2 kW/t |
| Heating Surface Equivalent | 214.4 m² |
| Cylinder volume/HSE | 1 : 1,039.58 |
| Adhesive weight/Total | 1 : 1.49 |
| Tractive force/Heating surface | 1 : 11.17 |
| Grate area/Heating surface | 1 : 81.18 |
| Firebox/Tube surface | 1 : 11.49 |
