| South African Class 91-000 |
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91-003 and 91-009 on a limestone train in April 1985 |
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| Specifications |
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Configuration:
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| • AAR | B-B |
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| • Commonwealth | Bo-Bo |
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| Gauge | 2 ft (610 mm)
3 ft 6 in (1,067 mm) (Bigfoot bogie) |
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| Wheel diameter | 838 mm (33 in) (2 ft gauge)
915 mm (36 in) (Bigfoot bogie) |
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| Wheelbase | 7,290 mm (23 ft 11 in)
7,314 mm (24 ft 0 in) Bigfoot |
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| • Bogie | 2,108 mm (6 ft 11 in)
2,082 mm (6 ft 10 in) Bigfoot |
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| Pivot centres | 5,232 mm (17 ft 2 in) |
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Length:
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| • Over couplers | 10,580 mm (34 ft 8+1⁄2 in) |
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| Width | 2,564 mm (8 ft 5 in) |
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| Height | 3,632 mm (11 ft 11 in) |
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| Axle load | 12,000 kg (26,000 lb) |
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| Adhesive weight | 48,000 kg (106,000 lb) |
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| Loco weight | 48,000 kg (106,000 lb) |
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| Fuel type | Diesel |
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| Fuel capacity | 1,600 litres (350 imp gal) |
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| Prime mover | Caterpillar D-379 |
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| RPM range | 650-1,365 |
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| • RPM idle | 650 |
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| • Maximum RPM | 1,365 |
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| Engine type | 4-stroke diesel |
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| Aspiration | Schwitzer 4ME 455 turbocharger |
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| Generator | 6 pole GE 5GT-601C1 |
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| Traction motors | Four GE 5GE-778AI DC 4 pole
Two GE 5GE-761-A13 DC 4 pole Bigfoot |
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| • Rating 1 hour | 410A, 665A Bigfoot |
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| • Continuous | 395A @ 14 km/h (8.7 mph)
655A @ 15 km/h (9.3 mph) Bigfoot |
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| Cylinders | V8 |
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| Gear ratio | 13:68:1 double reduction |
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| MU working | 3 maximum |
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| Loco brake | 28-LV-1 with vigilance control |
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| Train brakes | Westinghouse 4CD2UC compressor/exhauster |
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| Air tank cap. | 500 litres (110 imp gal) |
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| Compressor | 0.036 m3/s (1.3 cu ft/s) |
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| Exhauster | 0.072 m3/s (2.5 cu ft/s) |
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| Couplers | Willison
AAR knuckle (Bigfoot) |
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| Performance figures |
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| Maximum speed | 50 km/h (31 mph) |
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Power output:
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| • Starting | 520 kW (700 hp) |
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| • Continuous | 480 kW (640 hp) |
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Tractive effort:
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| • Starting | 108 kN (24,000 lbf) @ 25% adh. |
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| • Continuous | 86 kN (19,000 lbf) @ 15 km/h (9.3 mph) |
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Factor of adh.:
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| • Starting | 25% |
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| • Continuous | 20% |
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| Brakeforce | 60% ratio @ 345 kPa (50.0 psi) |
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| Dynamic brake peak effort | 85 kN (19,000 lbf) @ 14 km/h (8.7 mph) |
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| Career |
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| Operators | South African Railways
Spoornet
Transnet Freight Rail
RRL Grindrod |
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| Class | Class 91-000 |
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| Number in class | 20 |
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| Numbers | 91-001 to 91-020 |
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| Delivered | 1973 |
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| First run | 1973 |
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The South African Railways Class 91-000 of 1973 was a narrow-gauge diesel–electric locomotive.
Between September and December 1973, the South African Railways placed twenty Class 91-000 General Electric type UM6B diesel–electric locomotives in service on its narrow-gauge Avontuur Railway between Port Elizabeth in the Eastern Cape and Avontuur in the Western Cape. Some of them later also worked on the Alfred County Railway out of Port Shepstone in KwaZulu-Natal.
