South African Class NG9 4-6-0

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Power typeSteam
Power typeSteam
BuilderBaldwin Locomotive Works
South African Class NG9 4-6-0
Class NG9, c. 1930
Type and origin
Power typeSteam
DesignerBaldwin Locomotive Works
BuilderBaldwin Locomotive Works
Serial number42301-42306
Build date1915
Total produced6
Specifications
Configuration:
  Whyte4-6-0
  UIC2'Cn2
Driver2nd coupled axle
Gauge2 ft (610 mm) narrow
Leading dia.22 in (559 mm)
Coupled dia.33 in (838 mm)
Tender wheels22 in (559 mm)
Wheelbase36 ft 10 in (11,227 mm)
  Axle spacing
(Asymmetrical)
1-2: 3 ft 3 in (991 mm)
2-3: 3 ft (914 mm)
  Engine13 ft 1 in (3,988 mm)
  Leading4 ft (1,219 mm)
  Coupled6 ft 3 in (1,905 mm)
  Tender13 ft 7 in (4,140 mm)
  Tender bogie4 ft 1 in (1,245 mm)
Length:
  Over couplers44 ft 4+38 in (13,522 mm)
Height10 ft 4+14 in (3,156 mm)
Axle load5 LT 16 cwt (5,893 kg)
  Leading4 LT (4,064 kg)
  1st coupled5 LT 7 cwt (5,436 kg)
  2nd coupled5 LT 16 cwt (5,893 kg)
  3rd coupled5 LT 2 cwt (5,182 kg)
  Tender bogie10 LT 6 cwt (10,470 kg)
  Tender axle5 LT 3 cwt (5,233 kg) average
Adhesive weight16 LT 5 cwt (16,510 kg)
Loco weight20 LT 5 cwt (20,570 kg)
Tender weight20 LT 16 cwt 2 qtr (21,160 kg)
Total weight41 LT 1 cwt 2 qtr (41,730 kg)
Tender type2-axle bogies
Fuel typeCoal
Fuel capacity5 LT (5.1 t)
Water cap.1,250 imp gal (5,680 L)
Firebox:
  TypeRound-top
  Grate area7.5 sq ft (0.70 m2)
Boiler:
  Pitch4 ft 8+516 in (1,430 mm)
  Diameter3 ft 2+18 in (968 mm)
  Tube plates10 ft 8 in (3,251 mm)
  Small tubes67: 2 in (51 mm)
Boiler pressure180 psi (1,241 kPa)
Heating surface:
  Firebox43.4 sq ft (4.03 m2)
  Tubes381 sq ft (35.4 m2)
  Total surface424.4 sq ft (39.43 m2)
CylindersTwo
Cylinder size11+34 in (298 mm) bore
16 in (406 mm) stroke
Valve gearWalschaerts
Valve typeSlide
CouplersBell-and-hook
Performance figures
Tractive effort9,036 lbf (40.19 kN) @ 75%
Career
OperatorsSouth African Railways
Moçâmedes Railway
ClassClass NG9
Number in class6
NumbersNG42-NG47
Delivered1915–1916
First run1915
Withdrawn1951
The 2nd coupled axle had flangeless wheels

The South African Railways Class NG9 4-6-0 of 1915 was a narrow-gauge steam locomotive.

During 1915 and 1916, the South African Railways placed six 4-6-0 steam locomotives in service on the Langkloof narrow-gauge railway. When a system of grouping narrow-gauge locomotives into classes was eventually introduced somewhere between 1928 and 1930, they were classified as Class NG9.[1][2]

Due to the outbreak of the First World War in 1914, the usual British locomotive suppliers were hard pressed to satisfy British requirements at the time, let alone those of other parts of the world. As a result, the South African Railways (SAR) placed an order with the Baldwin Locomotive Works in the United States of America in 1915 for six narrow-gauge 4-6-0 locomotives. They were all built by August 1915 and were delivered to the SAR in 1915 and 1916, numbered in the range from NG42 to NG47.[1][2]

Characteristics

Service

References

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