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South African class NG15
| 1931 | 21 produced
NG 119
NG 119
SAR

When the Otavi Mining and Railway Company in South West Africa needed additional locomotives in 1931, the SAR ordered three class NG15 Mikados from Henschel in Germany. They were based on the Otavi class Hd and SAR class NG5, but were modernized in some aspects and had a larger tender.

A special feature of the new tender was the water tank that extended down to the axles to lower its center of gravity on the narrow gauge lines. As opposed to the earlier locomotives which had a metric gauge of 600 mm, the NG15 was built in two-foot gauge (610 mm). To ensure sufficient running characteristics in curves, the leading axle and the first driving axle were combined with a Krauss-Helmholtz bogie

After the first three locomotives, three more were built in 1939. Franco-Belge built ten more between 1950 and 1953. Besides the Otavi, the Tsumeb Copper Corporation got five identical locomotives in 1958. When the Otavi line was converted to cape gauge in 1960, the locomotives were transferred to the Avontuur line in the Western and Eastern Capes. There they got the nickname “Kalahari” due to their former region where they had operated. There they stayed in service even after all other non-Garratt locomotives had been retired.

Their commercial service ended in the late eighties, even though diesel locomotives had been used on the Avontuur since 1973. A huge number of NG15 are existing until today. Currently none of them is operational. In the near future, two are likely to be operational again in Britain on the Ffestiniog and the Welsh Highland Heritage Railway.

General
Built1931-1958
ManufacturerHenschel, Franco-Belge
Axle config2-8-2 (Mikado) 
Gauge2 ft 0 in (Two feet)
Dimensions and Weights
Length54 ft 3 3/16 in
Wheelbase20 ft 2 15/16 in
Fixed wheelbase9 ft 7 in
Total wheelbase44 ft 7 1/16 in
Service weight81,990 lbs
Adhesive weight59,216 lbs
Total weight151,876 lbs
Axle load15,148 lbs
Water capacity3,434 us gal
Fuel capacity12,346 lbs (coal)
Power
Power sourcesteam
Estimated power503 hp (375 kW)
Optimal speed17 mph
Starting effort19,235 lbf
Power Plant
Driver diameter33.9 in
Boiler pressure174 psi
Expansion typesimple
Cylinderstwo, 15 3/4 x 17 3/4 in
Boiler
Grate area16.7 sq ft
Firebox area67.8 sq ft
Tube heating area727.6 sq ft
Evaporative heating area795.5 sq ft
Superheater area183 sq ft
Total heating area978.4 sq ft
Calculated Values
steam locomotive
freight
narrow gauge
last changed: 05/2024
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