South African Class NG G16 2-6-2+2-6-2
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No. NG113 at Sandstone Estates, 9 April 2006
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| Type and origin | |
|---|---|
| ♠ All except no. NG137-NG143 ♥ All except no. NG137-NG143 & NG149-NG156 ♣ No. NG137-NG143 - ♦ No. NG149-NG156 |
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| Power type | Steam |
| Designer |
Hannoversche Maschinenbau AG South African Railways |
| Builder |
Société Anonyme John Cockerill Beyer, Peacock and Company Hunslet-Taylor |
| Serial number | Cockerill 3265-3268 Beyer, Peacock 6919-6926, 7426-7432, 7862-7868 Hunslet-Taylor 3894-3901 |
| Model | Class NG G16 |
| Build date | 1937-1968 |
| Total produced | 34 |
| Rebuilder | Alfred County Railway |
| Rebuild date | 1989-1990 |
| Number rebuilt | 2 to Class NG G16A |
| Specifications | |
|---|---|
| Configuration | 2-6-2+2-6-2 (Double Prairie) |
| Driver | 3rd & 4th coupled axles |
| Gauge | 2 ft (610 mm) narrow |
| Leading dia. | 21 in (533 mm) |
| Coupled dia. | 33 in (838 mm) |
| Trailing dia. | 21 in (533 mm) |
| Minimum curve | 160 ft (49 m) |
| Wheelbase | 43 ft 3 in (13,183 mm) |
| • Engine | 13 ft 10 1⁄2 in (4,229 mm) each |
| • Coupled | 6 ft 3 in (1,905 mm) each |
| Pivot centres | 23 ft 9 in (7,239 mm) |
| Length: |
|
| • Over couplers | 48 ft 5 1⁄4 in (14,764 mm) |
| Width | 7 ft (2,134 mm) |
| Height | 10 ft 4 in (3,150 mm) |
| Frame type | Bar |
| Axle load | ♠ 6 LT 18 cwt (7,011 kg) ♣ 6 LT 17 cwt 3 qtr (6,998 kg) |
| • Leading | ♠ 6 LT 10 cwt (6,604 kg) front 5 LT 14 cwt (5,791 kg) rear ♣ 6 LT 7 cwt 2 qtr (6,477 kg) front 6 LT 7 cwt 1 qtr (6,465 kg) rear |
| • 1st coupled | ♠ 6 LT 18 cwt (7,011 kg) ♣ 6 LT 14 cwt 3 qtr (6,846 kg) |
| • 2nd coupled | ♠ 6 LT 6 cwt (6,401 kg) ♣ 6 LT 17 cwt 3 qtr (6,998 kg) |
| • 3rd coupled | ♠ 6 LT 4 cwt (6,299 kg) ♣ 6 LT 15 cwt (6,858 kg) |
| • 4th coupled | ♠ 6 LT 15 cwt (6,858 kg) ♣ 6 LT 14 cwt 2 qtr (6,833 kg) |
| • 5th coupled | ♠ 6 LT 17 cwt (6,960 kg) ♣ 6 LT 14 cwt (6,808 kg) |
| • 6th coupled | ♠ 6 LT 1 cwt (6,147 kg) ♣ 6 LT 14 cwt 3 qtr (6,846 kg) |
| • Trailing | ♠ 3 LT 14 cwt (3,759 kg) front 3 LT 19 cwt (4,013 kg) rear ♣ 4 LT 1 cwt 1 qtr (4,128 kg) front 3 LT 10 cwt (3,556 kg) rear |
| Adhesive weight | ♠ 39 LT 1 cwt (39,680 kg) ♣ 40 LT 10 cwt 3 qtr (41,190 kg) |
| Loco weight | ♠ 59 LT 2 cwt (60,050 kg) ♣ 61 LT 5 cwt 2 qtr (62,260 kg) |
| Fuel type | Coal |
| Fuel capacity | ♠ 4 LT (4.1 t) ♣ 6 LT 4 cwt (6.3 t) |
| Water cap |
♥ 1,285 imp gal (5,840 l) front 540 imp gal (2,450 l) rear ♣ 1,325 imp gal (6,020 l) front ♦ 1,325 imp gal (6,020 l) front 540 imp gal (2,450 l) rear |
| Firebox type | Round-top |
| • Firegrate area | 19.5 sq ft (1.81 m2) |
| Boiler: |
|
| • Pitch | 5 ft 5 in (1,651 mm) |
| • Diameter | 4 ft 7 3⁄4 in (1,416 mm) |
| • Tube plates | 9 ft 3 5⁄8 in (2,835 mm) |
| • Small tubes | 152: 1 3⁄4 in (44 mm) |
| • Large tubes | 15: 5 1⁄2 in (140 mm) |
| Boiler pressure | 180 psi (1,241 kPa) |
| Safety valve | Pop |
| Heating surface | 921.1 sq ft (85.57 m2) |
| • Tubes | 839 sq ft (77.9 m2) |
| • Firebox | 82.1 sq ft (7.63 m2) |
| Superheater: |
|
| • Heating area | 149 sq ft (13.8 m2) |
| Cylinders | Four |
| Cylinder size | 12 in (305 mm) bore 16 in (406 mm) stroke |
| Valve gear | Walschaerts |
| Valve type | Piston |
| Couplers |
Bell link-and-pin (Natal) Bell lift-hook (Langkloof) |
| Performance figures | |
|---|---|
| Tractive effort | 18,850 lbf (83.8 kN) @ 75% |
| Career | |
|---|---|
| Operators | South African Railways Alfred County Railway Welsh Highland Railway |
| Class | Class NG G16 |
| Number in class | 34 |
| Numbers | NG85-NG88, NG109-NG116, NG125-NG131, NG137-NG143, NG149-NG156 |
| Delivered | 1937-1968 |
| First run | 1937 |
The South African Railways Class NG G16 2-6-2+2-6-2 of 1937 was a narrow gauge steam locomotive.
Between 1937 and 1968, the South African Railways placed 34 Class NG G16 Garratt articulated steam locomotives with a 2-6-2+2-6-2 Double Prairie type wheel arrangement in service on the Avontuur Railway and on the Natal narrow gauge lines.
The success of the Class NG G13 narrow gauge Garratts, which were introduced by the South African Railways (SAR) in 1927, led to a decision that any additional narrow gauge articulated locomotives would be of the same design. Altogether 34 more 2-6-2+2-6-2 Double Prairie type narrow gauge locomotives were built, spread over five orders from three manufacturers over a span of 31 years.
In 1937, Société Anonyme John Cockerill of Seraing in Belgium delivered four new 2-6-2+2-6-2 locomotives, numbered in the range from NG85 to NG88, which were so similar to the older locomotives that they were initially designated Class NG G13 as well. However, in view of the fact that all the carrying wheels were fitted with roller bearing axle boxes and arranged as pony trucks, compared to the Class NG G13 of which the inner carrying wheels were built to the Gölsdorf system which allowed the axle some lateral movement, it was soon decided to reclassify them to Class NG G16.
These pre-war locomotives, like the earlier Class NG G13 locomotives, were built with riveted coal and water bunkers and with large radius tops on the water tanks.
The second order of eight locomotives was delivered from Beyer, Peacock and Company in 1939. They were numbered in the range from NG109 to NG116.
The third order was for a further seven locomotives in 1951, numbered in the range from NG125 to NG131, once again from Beyer, Peacock. These and the subsequent locomotives had welded water and coal bunkers and flat-topped water tanks with rounded top side edges.
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Wikipedia