South African Class NG1 0-4-0T

CSAR Pankop 0-4-0T South African Class NG1 0-4-0T
Class NG1 no. NG40, with a sack of coal on the running board
Type and origin Power type Steam Designer Kerr, Stuart and Company Builder Kerr, Stuart and Company Serial number 676-677 Model S1 Sirdar Build date 1899 Total produced 2
Specifications Configuration: ​  • Whyte 0-4-0T (Four-coupled)  • UIC Bn2t Driver 2nd coupled axle Gauge 600 mm (1 ft 11 5⁄8 in) narrow Coupled dia. 24 in (610 mm) Wheelbase 3 ft 6 in (1,067 mm) Length: ​  • Over couplers 13 ft 6 in (4,115 mm) Height 8 ft 9 in (2,667 mm) Frame type Plate Axle load 3 LT 2 cwt 2 qtr (3,175 kg) av.  • Coupled 3 LT 2 cwt 2 qtr (3,175 kg) each Adhesive weight 6 LT 5 cwt (6,350 kg) Loco weight 6 LT 5 cwt (6,350 kg) Fuel type Coal Fuel capacity 5 long hundredweight (0.3 t) Water cap 90 imp gal (409 l) Firebox type Round-top  • Firegrate area 3.3 sq ft (0.31 m2) Boiler: ​  • Pitch 4 ft 4 3⁄4 in (1,340 mm)  • Diameter 2 ft (610 mm)  • Tube plates 5 ft 1 1⁄2 in (1,562 mm) Boiler pressure 140 psi (965 kPa) Safety valve Ramsbottom Heating surface 100 sq ft (9.3 m2)  • Tubes 83.5 sq ft (7.76 m2)  • Firebox 16.5 sq ft (1.53 m2) Cylinders Two Cylinder size 6 in (152 mm) bore 10 in (254 mm) stroke Valve gear Stephenson Valve type Murdoch's D slide Couplers Buffers-and-chain
Performance figures Tractive effort 1,575 lbf (7.01 kN) @ 75%
Career Operators British War Office Central South African Railways South African Railways Class SAR Class NG1 Number in class 2 Numbers CSAR 676-677, SAR NG40-NG41 Nicknames Pankop Delivered 1900 First run 1900 Withdrawn 1931

The South African Railways Class NG1 0-4-0T of 1900 was a narrow-gauge steam locomotive from the pre-Union era in Transvaal.

In 1900, the British War Office placed two Sirdar class 0-4-0T narrow-gauge tank steam locomotives in service near Germiston. At the end of the Second Boer War, the locomotives were sold to a farmer who used them on a firewood line out of Pienaarsrivier, until the line and locomotives were taken over by the Central South African Railways.

In 1912, when these locomotives were assimilated into the South African Railways, they were renumbered with an "NG" prefix to their numbers. When a system of grouping narrow-gauge locomotives into classes was eventually introduced somewhere between 1928 and 1930, they were designated Class NG1.

Three Sirdar class 0-4-0T narrow-gauge tank steam locomotives were built for Allan Alderson and Company of Cairo, for use during the Nile Barrage construction in Egypt. In November 1899, the Director of Army Contracts of the British War Office ordered two narrow-gauge steam locomotives from Kerr, Stuart and Company for delivery within ten days, since the locomotives were urgently needed by the Royal Engineers for use in a siege park in the Zuid-Afrikaansche Republiek where the Second Boer War was in progress. A siege park was a depot for holding engineer’s stores which could be required during a siege.

By diverting two of the three locomotives which were ready to be shipped out to the Nile Barrage construction works in Egypt, the locomotive builders were actually able to supply the engines within four days. The standard Sirdar class engines were similar to the single 2 ft 6 in (762 mm) gauge 2-4-2T engine Hope which had entered service in Walvis Bay in 1899, but without the leading and trailing pony wheels. Kerr, Stuart was a supplier of contractor's engines and often built locomotives to standard designs, but without frame stretchers and axles, and kept them in stock until an order was placed. This allowed them to be delivered with a minimum of delay.