South African Class 10C 4-6-2

CSAR Class 10-C 4-6-2
South African Class 10C & 10CR 4-6-2

Class 10CR no. 778 passing Woltemade No. 4, near present-day Thornton, c. 1940

Type and origin ♠ Class 10C as built with a Belpaire firebox ♥ Class 10C, superheated ♣ Class 10CR rebuilt with a Watson Standard boiler ʘ Type XC tender - ʘ Type XM2 tender Power type Steam Designer Central South African Railways (G.G. Elliot) Builder North British Locomotive Company Serial number 19195-19206 Model CSAR Class 10-C Build date 1910 Total produced 12

Specifications Configuration 4-6-2 (Pacific) Driver 2nd coupled axle Gauge 3 ft 6 in (1,067 mm) Cape gauge Leading dia. 28 1⁄2 in (724 mm) Coupled dia. 57 in (1,448 mm) Trailing dia. 33 in (838 mm) Tender wheels ʘʘ 33 1⁄2 in (851 mm) as built ʘʘ 34 in (864 mm) retyred Wheelbase 52 ft 4 1⁄2 in (15,964 mm)  • Engine 28 ft 7 1⁄2 in (8,725 mm)  • Leading 6 ft (1,829 mm)  • Coupled 10 ft (3,048 mm)  • Tender ʘ 14 ft 7 in (4,445 mm) ʘ 16 ft 9 in (5,105 mm)  • Tender bogie ʘʘ 4 ft 7 in (1,397 mm) Length: ​  • Over couplers ʘ 59 ft 3⁄4 in (18,002 mm) ʘ 62 ft 9 in (19,126 mm) Height ♠♥ 12 ft 10 in (3,912 mm) ♣ 12 ft 11 in (3,937 mm) Axle load ♠ 14 LT (14,220 kg) ♥ 14 LT 14 cwt (14,940 kg) ♣ 15 LT 6 cwt (15,550 kg)  • Leading ♠ 11 LT 11 cwt (11,740 kg) ♥ 13 LT 12 cwt (13,820 kg) ♣ 15 LT 6 cwt (15,550 kg)  • Coupled ♠ 14 LT (14,220 kg)  • 1st coupled ♥ 13 LT 19 cwt (14,170 kg) ♣ 14 LT 14 cwt (14,940 kg)  • 2nd coupled ♥ 14 LT 14 cwt (14,940 kg) ♣ 15 LT 6 cwt (15,550 kg)  • 3rd coupled ♥ 14 LT 2 cwt (14,330 kg) ♣ 14 LT 14 cwt (14,940 kg)  • Trailing ♠ 11 LT 4 cwt (11,380 kg) ♥ 11 LT 15 cwt (11,940 kg) ♣ 12 LT 6 cwt (12,500 kg)  • Tender bogie Bogie 1: ʘ 17 LT (17,270 kg) ʘ 24 LT 4 cwt (24,590 kg) Bogie 2: ʘ 17 LT 16 cwt (18,090 kg) ʘ 25 LT 3 cwt (25,550 kg)  • Tender axle ʘ 8 LT 18 cwt (9,043 kg) ʘ 12 LT 11 cwt 2 qtr (12,780 kg) Adhesive weight ♠ 42 LT (42,670 kg) ♥ 42 LT 15 cwt (43,440 kg) ♣ 44 LT 14 cwt (45,420 kg) Loco weight ♠ 64 LT 15 cwt (65,790 kg) ♥ 68 LT 2 cwt (69,190 kg) ♣ 72 LT 6 cwt (73,460 kg) Tender weight ʘ 34 LT 16 cwt (35,360 kg) ʘ 49 LT 7 cwt (50,140 kg) Total weight ♠ʘ 99 LT 11 cwt (101,100 kg) ♠ʘ 114 LT 2 cwt (115,900 kg) ♥ʘ 102 LT 18 cwt (104,600 kg) ♥ʘ 117 LT 9 cwt (119,300 kg) ♣ʘ 121 LT 13 cwt (123,600 kg) Tender type XC (2-axle bogies) XM2 (2-axle bogies) XC, XC1, XD, XE, XE1, XF, XF1, XF2, XJ, XM, XM1, XM2, XM3, XM4, XP1, XS permitted Fuel type Coal Fuel capacity ʘ 5 LT (5.1 t) ʘ 10 LT (10.2 t) Water cap ʘ 2,600 imp gal (11,800 l) ʘ 4,000 imp gal (18,200 l) Generator Pyle National turbo-generator Firebox type ♠ Belpaire - ♣ Round-top  • Firegrate area ♠♥ 32 sq ft (3.0 m2) ♣ 36 sq ft (3.3 m2) Boiler: ​  • Model ♣ Watson Standard no. 1  • Pitch ♠♥ 7 ft 4 in (2,235 mm) ♣ 8 ft (2,438 mm)  • Diameter ♠♥ 4 ft 8 1⁄4 in (1,429 mm) ♣ 5 ft (1,524 mm)  • Tube plates ♠♥ 16 ft 6 1⁄2 in (5,042 mm) ♣ 17 ft 9 in (5,410 mm)  • Small tubes ♠ 183: 2 1⁄4 in (57 mm) ♥ 100: 2 1⁄4 in (57 mm) ♣ 76 2 1⁄2 in (64 mm)  • Large tubes ♥ 18: 5 1⁄2 in (140 mm) ♣ 24: 5 1⁄2 in (140 mm) Boiler pressure ♠♥♣ 200 psi (1,379 kPa) Safety valve ♠♥ Ramsbottom ♣ Pop Heating surface ♠ 1,905 sq ft (177.0 m2) ♥ 1,525 sq ft (141.7 m2) ♣ 1,620 sq ft (151 m2)  • Tubes ♠ 1,783 sq ft (165.6 m2) ♥ 1,403 sq ft (130.3 m2) ♣ 1,497 sq ft (139.1 m2)  • Firebox ♠♥ 122 sq ft (11.3 m2) ♣ 123 sq ft (11.4 m2) Superheater: ​  • Heating area ♥ 345 sq ft (32.1 m2) ♣ 366 sq ft (34.0 m2) Cylinders Two Cylinder size ♠♥♣ 18 in (457 mm) bore ♠♥♣ 26 in (660 mm) stroke Valve gear Walschaerts Valve type Piston Couplers Johnston link-and-pin AAR knuckle (1930s)

Performance figures Tractive effort ♠♥♣ 22,170 lbf (98.6 kN) @ 75%

Career Operators Central South African Railways South African Railways Class CSAR Class 10-C, SAR Class 10C Number in class 12 Numbers CSAR 1003-1014, SAR 767-778 Delivered 1910-1911 First run 1910 Withdrawn 1973

External video

South African Steam: 10CR & 19D Loraine Gold Mine Open Day August 1997 Class 10CR no. 771 and Class 19D numbers 2765 and 3369, working at the Lorraine Gold Mine in the Free State, August 1997. (Time 8:42)

The South African Railways Class 10C 4-6-2 of 1910 was a steam locomotive from the pre-Union era in Transvaal.

In 1910, the Central South African Railways placed twelve Class 10-C 4-6-2 Pacific type steam locomotives in service. In 1912, these locomotives were renumbered and designated Class 10C on the South African Railways roster.

In November and December 1910, twelve light 4-6-2 Pacific type passenger locomotives were placed in service by the Central South African Railways (CSAR). Designed by G.G. Elliot, Chief Mechanical Engineer (CME) of the CSAR, they were built along similar lines to the Class 10-2 which had been delivered to the CSAR earlier in that same year, but they were slightly smaller and had smaller coupled wheels.

They were built for the CSAR by the North British Locomotive Company (NBL) and were designated Class 10-C, numbered in the range from 1003 to 1014. As built, they used saturated steam and had Belpaire fireboxes and Walschaerts valve gear.

They embodied some of the features of their larger Class 10-2 superheated predecessors, with the notable exceptions of the feedwater heaters and superheating. They were also fitted with the Flaman speed recorder, of which the driving gear was connected to the right trailing crank pin. A new feature was the placing of the Pyle National turbo-generator unit behind the dome on top of the boiler barrel.

Since they were originally intended for local passenger work around the Reef, the locomotives had been delivered with comparatively small Type XC tenders with a coal capacity of 5 long tons (5.1 tonnes) and 2,600 imperial gallons (11,800 litres) of water.

Their outside-admission piston valves with straight-ported cylinders made them extraordinarily free runners and they were soon found suitable for the mainline as well. To better equip them to handle mainline passenger trains, an order for new larger Type XM2 tenders was placed with Robert Stephenson and Company. Since the original tenders were already numbered for their respective engines, the new tenders, with works numbers D1540/1 to D1540/12, were numbered N1 to N12. They had a coal capacity of 10 long tons (10.2 tonnes) and 4,000 imperial gallons (18,200 litres) of water.