Rhodesia Railways 20th class Zambia Railways 20th class National Railways of Zimbabwe 20th class
NRZ 20A class No. 747, at the coal stage, Dete, July 1990
Type and origin
Power type
Steam
Builder
Beyer, Peacock and Company
Build date
1954–1958
Total produced
61
Specifications
Configuration:
• Whyte
4-8-2+2-8-4
• UIC
(2′D1′)(1′D2′) h4t
Gauge
3 ft 6 in (1,067 mm) Cape gauge
Driver dia.
51 in (1,295 mm)
Length
103 ft 2 in (31.45 m)
Fuel type
Coal
Firebox:
• Grate area
63 sq ft (5.9 m2)
Boiler pressure
200 psi (1.38 MPa)
Heating surface:
• Firebox
235 sq ft (21.8 m2)
• Tubes and flues
2,790 sq ft (259 m2)
• Total surface
3,025 sq ft (281.0 m2)
Superheater:
• Heating area
750 sq ft (70 m2)
Cylinders
Four
Cylinder size
20 in × 26 in (508 mm × 660 mm)
Train brakes
Vacuum
Career
Operators
Rhodesia Railways Zambia Railways National Railways of Zimbabwe
Class
20th, 20A
Numbers
RR: 700–760 NRZ: 730–737, 740–750
Withdrawn
1970–1992
The Rhodesia Railways 20th class, later Zambia Railways and National Railways of Zimbabwe 20th classes, were among the largest and most powerful steam locomotives in the southern hemisphere.
With 61 locomotives built, they were the fourth largest class of Garratt locomotive built – after the South African Railways class GMA, (120), the Rhodesia Railways 15th class, (74) and the South African Railways class GF (65).
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