The South African Railways Class 1 4-8-0 of 1904 was a steam locomotive from the pre-Union era in the Colony of Natal.

NGR Class B 4-8-0 1904 South African Class 1 4-8-0
SAR Class 1 no. 1245, ex NGR Class B no. 275
Type and origin Power type Steam Designer Natal Government Railways (D.A. Hendrie) Builder North British Locomotive Company Serial number 16370-16419 Model NGR Class B Build date 1904 Total produced 50 Rebuilder Natal Government Railways Rebuild date 1906 Number rebuilt 6 to Class B 4-8-2 (Mountain)
Specifications Configuration: ​  • Whyte 4-8-0 (Mastodon)  • UIC 2'Dn2 Driver 2nd coupled axle Gauge 3 ft 6 in (1,067 mm) Cape gauge Leading dia. 28+1⁄2 in (724 mm) Coupled dia. 45+1⁄2 in (1,156 mm) Tender wheels 30 in (762 mm) Wheelbase 49 ft 5⁄8 in (14,951 mm)  • Engine 22 ft 6 in (6,858 mm)  • Leading 6 ft (1,829 mm)  • Coupled 12 ft 9 in (3,886 mm)  • Tender 15 ft 6 in (4,724 mm)  • Tender bogie 4 ft 6 in (1,372 mm) Length: ​  • Over couplers 56 ft 4+7⁄8 in (17,193 mm) Height 12 ft 6+1⁄4 in (3,816 mm) Frame type Plate Axle load 14 LT 14 cwt (14,940 kg)  • Leading 14 LT 2 cwt (14,330 kg)  • 1st coupled 13 LT 9 cwt (13,670 kg)  • 2nd coupled 14 LT 14 cwt (14,940 kg)  • 3rd coupled 13 LT 18 cwt (14,120 kg)  • 4th coupled 13 LT 18 cwt (14,120 kg)  • Tender bogie Bogie 1: 18 LT 18 cwt (19,200 kg) Bogie 2: 19 LT 1 cwt (19,360 kg)  • Tender axle 9 LT 10 cwt 2 qtr (9,678 kg) Adhesive weight 55 LT 19 cwt (56,850 kg) Loco weight 70 LT 11 cwt (71,680 kg) Tender weight 37 LT 19 cwt (38,560 kg) Total weight 108 LT 10 cwt (110,200 kg) Tender type SH (2-axle bogies) SH, SK permitted Fuel type Coal Fuel capacity 6 LT (6.1 t) Water cap. 3,225 imp gal (14,700 l) Firebox type Belpaire with combustion chamber  • Firegrate area 34 sq ft (3.2 m2) Boiler: ​  • Pitch 7 ft 3+1⁄4 in (2,216 mm)  • Diameter 5 ft 4+3⁄4 in (1,645 mm)  • Tube plates 12 ft 1 in (3,683 mm)  • Small tubes 325: 2 in (51 mm) Boiler pressure 190 psi (1,310 kPa) Safety valve Ramsbottom Heating surface 2,188 sq ft (203.3 m2)  • Tubes 2,056 sq ft (191.0 m2)  • Firebox 132 sq ft (12.3 m2) Cylinders Two Cylinder size 20+1⁄2 in (521 mm) bore 24 in (610 mm) stroke Valve gear Walschaerts Valve type Balanced slide Couplers Johnston link-and-pin AAR knuckle (1930s)
Performance figures Tractive effort 31,240 lbf (139.0 kN) @ 75%
Career Operators Natal Government Railways South African Railways Class NGR Class B SAR Class 1 Number in class 44 Numbers NGR 275-318 SAR 1245-1288 Nicknames Hendrie B Delivered 1904 First run 1904 Withdrawn 1975
The leading coupled axle had flangeless wheels

In 1904, the Natal Government Railways placed fifty Class B 4-8-0 Mastodon type steam locomotives in service. Six of them were modified to a 4-8-2 Mountain type wheel arrangement in 1906. In 1912, when the remaining 44 4-8-0 locomotives were assimilated into the South African Railways, they were renumbered and designated Class 1.[1][2][3][4]

Design

Because of the limited coal and water range of the existing fleet of Natal Government Railways (NGR) tank locomotives as well as the necessity to double- and even triple-head over the worst sections of the mainline, NGR Locomotive Superintendent D.A. Hendrie was tasked to produce a locomotive of greater power and capable of longer distances without refuelling or rewatering to work the mainline's steep 1 in 30 (31⁄3%) gradients.[1][4][5][6]

His resulting Class B achieved this, being more powerful and with a longer range. When the designs were completed, Hendrie proposed that only five locomotives should be ordered so that they may first be thoroughly tested in service before ordering more. The designs, however, were so well received that the NGR placed an immediate order for fifty locomotives with the North British Locomotive Company (NBL).[1]

Manufacturer

It does appear as though there was a fair degree of urgency to obtain these locomotives, evidenced on the one hand by the rush to place a large order for an untested locomotive and on the other hand by the fact that construction was accelerated by dividing it equally between NBL's Hyde Park and Queens Park works. The NGR's faith in Hendrie's ability turned out to be well justified, however, considering the fact that some of these locomotives remained in service for over seventy years.[1][7]

Delivered in 1904, the Class B 4-8-0 Mastodon type was the first tender locomotive to be placed in service by the NGR apart from the single home-built 4-6-2TT engine Havelock of 1888. Fifty were built, those numbered in the range from 275 to 299 at the NBL Hyde Park works and those numbered in the range from 300 to 324 at the NBL Queens Park works.[1][2][4][6]

The type SH tender was introduced along with these locomotives. It rode on two-axle bogies and had a capacity of 6 long tons (6.1 tonnes) coal and 3,225 imperial gallons (14,700 litres) water.[6]

Characteristics

Combustion chamber

Even though the boiler was not pitched very high, Hendrie had still managed to extend the Belpaire firebox sideways over the trailing coupled wheels, with the result that the grate was almost on a level with the bottom of the boiler shell. To prevent the fire from entering the lower row of tubes, Hendrie arranged a vertical firewall towards the front of the grate, which also created a dry combustion chamber.[2][4]

This combustion chamber pre-dated the Gaines type, which was practically identical, by four years. The Gaines type was introduced in the United States of America in 1908 and became widely used on American locomotives. The firebox, of which the external dimensions were 9 feet 6 inches (2,896 millimetres) long and 6 feet (1,829 millimetres) wide, was arranged with finger bars and drop grates with a hopper-type ashpan.[1][2]

Valve gear

The cylinders were arranged outside the 1+3⁄8 inches (35 millimetres) thick plate frames, with the flat D type balanced slide valves arranged above the cylinders and actuated by Walschaerts valve gear, the first time that this type of motion was used in Natal.[2]

Electric headlight

Shortly after engine no. 275 had run its trials on 25 October 1904, it was fitted with a Pyle National Electric headlight which consisted of a self-contained turbine and dynamo and an arc lamp, placed on top of the smokebox in front of the chimney and supported by two brackets. The headlight proved so successful that it gradually replaced the old huge oil-burning lamps, which had been in use for over fifty years, on all mainline locomotives.[1][2]

Performance

Compared to the Reid Tenwheeler, the Class B was able to haul 7.5% more load and, on average, ran 26,000 miles (41,843 kilometres) more before requiring repairs.[2]

Modifications

Six of the locomotives, those numbered in the range from 319 to 324, were modified to 4-8-2 Mountain types in 1906, but retained their Class B designation on the NGR.[1]

Another locomotive, no. 280, was equipped with steam reversing gear in 1907, also to Hendrie's design. The steam reverser proved to be an unqualified success and was soon adopted as standard equipment on the rest of the Class. It was fitted to all engines which were subsequently designed by Hendrie and remained the standard reverser on South African steam locomotives well into the 1940s.[1][2]

South African Railways

When the Union of South Africa was established on 31 May 1910, the three Colonial government railways (Cape Government Railways, NGR and Central South African Railways) were united under a single administration to control and administer the railways, ports and harbours of the Union. Although the South African Railways and Harbours came into existence in 1910, the actual classification and renumbering of all the rolling stock of the three constituent railways were only implemented with effect from 1 January 1912.[3][8]

In 1912, the remaining 44 Mastodon types were renumbered in the range from 1245 to 1288 and designated Class 1 on the South African Railways (SAR). Upon their renumbering onto the SAR roster, the six modified 4-8-2 Mountain types were classified separately from the rest as Class 1B.[1][3][4][9]

Service

The locomotives were placed in service hauling all the fast passenger and goods trains between Durban and Pietermaritzburg and were the first locomotives to accomplish a return working of this service within a day, with the same crewmen. These locomotives opened up a new era on the NGR, where the tank locomotive was at last withdrawn from mainline working. Later, in SAR service, these locomotives were also used on mainline workings out of Port Elizabeth.[1][2][4]

In their later years they were relegated to shunting, particularly working in Natal but also in Cape Town, Port Elizabeth, East London and in Transvaal. Although their gradual withdrawal from service already commenced in 1935, half of the Class were still in capital stock by March 1972, with the last one only being written off in 1975.[4][5]

In industrial service, two of the locomotives survived even longer and were still in service in 1984.[5]

• SAR no. 1252 as Randfontein Estates Gold Mine no. 4.
• SAR no. 1277 as Apex Mines no. 2 at Greenside.

Works numbers and renumbering

Their works numbers, numbering, SAR reclassification and renumbering are listed in the table.[1]

Preservation

Only two of these engines survive.

Illustration

The main picture shows NGR Class B no. 275, later SAR Class 1 no. 1245, as delivered. The Belpaire firebox is markedly longer than usual as a result of the combustion chamber.

• 
  NGR no. 277, SAR no. 1247, at Mason's Mill, Pietermaritzburg, 29 March 1979
• 
  NGR no. 282, SAR no. 1252, REGM no. 4, at SANRASM, 6 June 2011
• 
  NGR no. 307, SAR no. 1277, at Delmas Colliery, Hawerklip, May 1977

References

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