South African Class NG G14 2-6-2+2-6-2

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

South African Class NG G14 2-6-2+2-6-2
Class NG G14 84 (2-6-2+2-6-2).jpg
Class NG G14 no. NG84, c. 1931
Type and origin
Power typeSteam
DesignerHannoversche Maschinenbau AG
BuilderHannoversche Maschinenbau AG
Serial number10747
ModelClass NG G14
Build date1930
Total produced1
Specifications
Configuration:
 • Whyte2-6-2+2-6-2 (Double Prairie)
 • UIC1'C1'+1'C1'h4t
Driver3rd & 4th coupled axles
Gauge2 ft (610 mm) narrow
Leading dia.21 in (533 mm)
Coupled dia.30 in (762 mm)
Trailing dia.21 in (533 mm)
Wheelbase40 ft 6 in (12,344 mm)
 • Engine13 ft 3 in (4,039 mm) each
 • Coupled5 ft 9 in (1,753 mm) each
Pivot centres21 ft (6,401 mm)
Length:
 • Over couplers46 ft 2 38 in (14,081 mm)
Height10 ft (3,048 mm)
Frame typePlate
Axle load4 LT (4,064 kg)
 • Leading3 LT 13 cwt 1 qtr (3,721 kg) front
3 LT 12 cwt 1 qtr (3,670 kg) rear
 • 1st coupled3 LT 18 cwt 3 qtr (4,001 kg)
 • 2nd coupled3 LT 17 cwt 3 qtr (3,950 kg)
 • 3rd coupled3 LT 19 cwt (4,013 kg)
 • 4th coupled4 LT (4,064 kg)
 • 5th coupled3 LT 19 cwt 2 qtr (4,039 kg)
 • 6th coupled3 LT 17 cwt 3 qtr (3,950 kg)
 • Trailing3 LT 6 cwt 2 qtr (3,378 kg) front
3 LT 10 cwt (3,556 kg) rear
Adhesive weight23 LT 12 cwt 3 qtr (24,020 kg)
Loco weight37 LT 14 cwt 3 qtr (38,340 kg)
Fuel typeCoal
Fuel capacity2 LT (2.0 t)
Water cap800 imp gal (3,640 l) front
200 imp gal (909 l) rear
Firebox typeRound-top
 • Firegrate area10.5 sq ft (0.98 m2)
Boiler:
 • Pitch5 ft 3 in (1,600 mm)
 • Diameter3 ft 6 38 in (1,076 mm)
 • Tube plates8 ft 5 78 in (2,588 mm)
 • Small tubes73: 1 34 in (44 mm)
 • Large tubes10: 5 14 in (133 mm)
Boiler pressure180 psi (1,241 kPa)
Safety valvePop
Heating surface423.5 sq ft (39.34 m2)
 • Tubes378.5 sq ft (35.16 m2)
 • Firebox45 sq ft (4.2 m2)
Superheater:
 • Heating area97.5 sq ft (9.06 m2)
CylindersFour
Cylinder size9 in (229 mm) bore
16 in (406 mm) stroke
Valve gearWalschaerts
Valve typePiston
CouplersBell-and-hook
Performance figures
Tractive effort11,664 lbf (51.88 kN) @ 75%
Career
OperatorsSouth African Railways
ClassClass NG G14
Number in class1
NumbersNG84
Delivered1931
First run1931
Withdrawn1952

The South African Railways Class NG G14 2-6-2+2-6-2 of 1931 was an articulated narrow gauge steam locomotive.

In 1931, the South African Railways placed a single lightweight Class NG G14 Garratt articulated steam locomotive with a 2-6-2+2-6-2 Double Prairie type wheel arrangement in service.[1][2]

Manufacturer[edit]

A single narrow gauge Garratt locomotive was built for the South African Railways (SAR) by Hannoversche Maschinenbau AG (Hanomag) in 1930. It was very similar to, but slightly larger and heavier than the Class NG G12 of 1927, the smallest Garratt to ever enter service on the SAR. Upon delivery, it was designated Class NG G14 and numbered NG84.[1][2][3][4]

Characteristics[edit]

The Class NG G14 locomotive had a 2-6-2+2-6-2 Double Prairie type wheel arrangement like all the previous and subsequent narrow gauge SAR Garratts except the first, the 2-6-0+0-6-2 Double Mogul type Class NG G11. It was very similar in dimensions to the earlier Class NG G12, but it had cylinders with a 12 inch (13 millimetres) larger bore which not only resulted in more power, but also an increase in axle loading. Like the Class NG G12, it also had an outside plate frame, a round-topped firebox and was superheated. Its piston valves were actuated by Walschaerts valve gear.[1][2][3]

Service[edit]

The Class NG G14 was placed in service on the narrow gauge line from Fort Beaufort to Seymour, where it became stable mate to Class NG G12 no. NG57. Its service life was similar to that of no. NG57, both being occasionally temporarily assigned to narrow gauge branch lines in other areas of the country to meet seasonal demands on those lines.[1]

In 1940, when the Seymour branch was regauged to Cape gauge, the Class NG G14 and Class NG G12 no. NG57 were both transferred to the Kakamas branch, where they joined Class NG G12 no. NG56 working out of Upington. All three remained there until 1949, when the Kakamas line was also widened to Cape Gauge and they were transferred to South West Africa for a brief period.[1][2]

From there, the Class NG G14 was allocated to Humewood Road in Port Elizabeth where it remained until it was withdrawn from service in 1952.[1]

References[edit]

  1. ^ a b c d e f Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 10–11, 107. ISBN 0869772112.
  2. ^ a b c d Espitalier, T.J.; Day, W.A.J. (1946). The Locomotive in South Africa - A Brief History of Railway Development. Chapter VII - South African Railways (Continued). South African Railways and Harbours Magazine, February 1946. p. 135.
  3. ^ a b Hamilton, Gavin N., The Garratt Locomotive - Garratt Locomotives from Other Builders, retrieved 10 November 2012
  4. ^ South African Railways and Harbours Locomotive Diagram Book, 2'0" & 3'6" Gauge Steam Locomotives, 15 August 1941, as amended