South West African Class Hd

GSWA Class Hd 2-8-2 South West African Class Hd 2-8-2 South African Class NG5 2-8-2
No. 40 plinthed at Usakos, May 1984
Type and origin Power type Steam Designer Henschel and Son Builder Henschel and Son Serial number 10720-10722 Model Class Hd Build date 1912 Total produced 3
Specifications Configuration: ​  • Whyte 2-8-2  • UIC 1D1h2 Driver 3rd coupled axle Gauge 600 mm (1 ft 11+5⁄8 in) narrow Leading dia. 21+21⁄32 in (550 mm) Coupled dia. 33+7⁄8 in (860 mm) Trailing dia. 21+21⁄32 in (550 mm) Tender wheels 20+1⁄2 in (521 mm) Wheelbase 38 ft 6+5⁄8 in (11,751 mm) ​  • Axle spacing (Asymmetrical) 1-2: 3 ft 1+7⁄16 in (951 mm) 2-3: 3 ft 4+1⁄8 in (1,019 mm) 3-4: 3 ft 1+7⁄16 in (951 mm)  • Engine 17 ft 11⁄16 in (5,199 mm)  • Coupled 9 ft 7 in (2,921 mm)  • Tender 11 ft 5+3⁄4 in (3,499 mm)  • Tender bogie 3 ft 3+3⁄8 in (1,000 mm) Length: ​  • Over couplers 49 ft 9+1⁄4 in (15,170 mm) Height 10 ft 9+15⁄16 in (3,300 mm) Frame type Plate Loco weight 32 LT 17 cwt (33,380 kg) Tender weight 25 LT 11 cwt 3 qtr (26,000 kg) Total weight 58 LT 8 cwt 3 qtr (59,380 kg) Tender type 2-axle bogies Fuel type Coal Fuel capacity 2 LT 17 cwt (2.9 t) Water cap. 2,860 imp gal (13,000 L) Firebox: ​  • Type Round-top  • Grate area 16.7 sq ft (1.55 m2) Boiler: ​  • Pitch 5 ft 8+7⁄8 in (1,749 mm)  • Diameter 3 ft 11+3⁄4 in (1,213 mm)  • Tube plates 13 ft 1+1⁄2 in (4,000 mm)  • Small tubes 114: 1+3⁄4 in (44 mm)  • Large tubes 12: 4+23⁄32 in (120 mm) Boiler pressure 171 psi (1,179 kPa) Heating surface: ​  • Firebox 68 sq ft (6.3 m2)  • Tubes 900 sq ft (84 m2)  • Total surface 968 sq ft (89.9 m2) Superheater: ​  • Heating area 169 sq ft (15.7 m2) Cylinders Two Cylinder size 15+3⁄4 in (400 mm) bore 17+3⁄4 in (451 mm) stroke Valve gear Heusinger Valve type Piston Loco brake Air Train brakes Air & vacuum Couplers Buffer-and-chains
Performance figures Tractive effort 16,610 lbf (73.9 kN) @ 75%
Career Operators Otavi Mining and Railway Co. South African Railways Class GSWA Class Hd, SAR Class NG5 Number in class 3 Numbers SW40-SW42 Delivered 1912 First run 1912 Withdrawn 1960

The South West African Class Hd 2-8-2 of 1912 was a narrow gauge steam locomotive from the German South West Africa era.

In 1912, the German administration in German South West Africa acquired three Class Hd tender locomotives with a 2-8-2 "Mikado" wheel arrangement, for lease to the Otavi Mining and Railway Company to use on the line from Swakopmund to Karibib. When these locomotives were taken onto the roster of the South African Railways after the First World War, they retained their German classification and engine numbers, but with an "SW" prefix to their numbers.^[1][2]

When a system of grouping narrow gauge locomotives into classes was eventually introduced by the South African Railways, they were designated Class NG5 along with similar locomotives which were placed in service by the South African Railways in 1922.^[1][3][4]