Kenya-Uganda Railway classes EC4 and EC5
Tanganjika Railways class GB and East African classes 54, 55 and 56
Kenya 1944 24 produced
For the requirements of the Second World War, the KUR had seven Garratts of the EC4 class built from 1944, which had a high power despite their light construction. In 1945, the KUR received two more or less identical EC5s, four of which went to the Tanganyika Railways and others to India and Burma. The KUR soon received the machines from Tanganyika and five from Burma. Six more, slightly revised locomotives were ordered in 1949. These entered service directly for the East African Railways and were designated the Class 56, while the EC4 and EC5 formed the Classes 54 and 55.
Technical data
General
| Property | EC4, EC5 | 56 |
|---|---|---|
| Built | 1944-1945 | 1949 |
| Manufacturers | Beyer, Peacock & Co. | |
| Wheel arrangement | 4-8-2+2-8-4T (Double Mountain (Garratt)) | |
| Gauge | 1,000 mm (Meter gauge) | |
Dimensions and weights
| Property | EC4, EC5 | 56 |
|---|---|---|
| Wheelbase | 23.70 m | 24.11 m |
| Service mass | 174.3 t | 149.2 t |
| Adhesion mass | 113.8 t | 89.4 t |
| Axle load | 14.2 t | 10.9 t |
| Water capacity | 27,278 l | 19,094 l |
| Fuel capacity | 1.3 t (oil) | |
Boiler
| Property | EC4, EC5 | 56 |
|---|---|---|
| Grate area | 4.766 m² | 4.534 m² |
| Firebox surface | 19.695 m² | 15.236 m² |
| Tube heating surface | 216.278 m² | 162.859 m² |
| Evaporative heating surface | 235.974 m² | 178.095 m² |
| Superheater surface | 43.664 m² | 34.374 m² |
| Total heating surface | 279.6 m² | 212.5 m² |
Power plant
| Property | EC4, EC5 | 56 |
|---|---|---|
| Driver diameter | 1,156 mm | 1,219 mm |
| Boiler pressure | 12.4 bar | 13.8 bar |
| Expansion type | simple expansion | |
| Cylinders | four, 483 x 610 mm | four, 406 x 610 mm |
Power
| Property | EC4, EC5 | 56 |
|---|---|---|
| Power source | steam | |
| Estimated power | 1,268 kW (1,724 PS) | 1,212 kW (1,648 PS) |
| Starting effort | 259.2 kN | 193.6 kN |
Calculated values
| Property | EC4, EC5 | 56 |
|---|---|---|
| Factor of adhesion | 1 : 4.31 | 1 : 4.53 |
| Optimal speed | 31 km/h | 39 km/h |
| Power-to-weight ratio | 7.3 kW/t | 8.1 kW/t |
| Heating Surface Equivalent | 421.8 m² | 323.0 m² |
| Cylinder volume/HSE | 1 : 1,057.52 | 1 : 979.19 |
| Adhesive weight/Total | 1 : 1.53 | 1 : 1.67 |
| Tractive force/Heating surface | 1 : 19.36 | 1 : 19.03 |
| Grate area/Heating surface | 1 : 58.67 | 1 : 46.86 |
| Firebox/Tube surface | 1 : 10.98 | 1 : 10.69 |
| Total/Superheater | 1 : 5.40 | 1 : 5.18 |
