South African Class 14A 4-8-2

South African Class 14A & 14R 4-8-2
Class 14R no. 1905 at Klerksdorp, 17 April 1978
Type and origin ♠ Class 14A as built with a Belpaire firebox ♥ Class 14R rebuilt with a Watson Standard boiler ♣ Steel firebox - ♦ Copper firebox Power type Steam Designer South African Railways (D.A. Hendrie) Builder North British Locomotive Company Serial number 20568-20587, 20822-20842 Model Class 14A Build date 1914 Total produced 41
Specifications Configuration: ​  • Whyte 4-8-2 (Mountain)  • UIC 2'D1'h2 Driver 2nd coupled axle Gauge 3 ft 6 in (1,067 mm) Cape gauge Leading dia. 28 1⁄2 in (724 mm) Coupled dia. 48 in (1,219 mm) Trailing dia. 33 in (838 mm) Tender wheels 34 in (864 mm) Wheelbase 56 ft 11 3⁄4 in (17,367 mm)  • Engine 30 ft 7 in (9,322 mm)  • Leading 6 ft 2 in (1,880 mm)  • Coupled 12 ft 9 in (3,886 mm)  • Tender 16 ft 9 in (5,105 mm)  • Tender bogie 4 ft 7 in (1,397 mm) Length 65 ft 4 5⁄8 in (19,929 mm) Height ♠ 12 ft 10 in (3,912 mm) ♥ 12 ft 11 3⁄4 in (3,956 mm) Axle load ♠ 15 LT (15,240 kg) ♥♣ 15 LT 16 cwt (16,050 kg)  • Leading ♠ 14 LT 6 cwt (14,530 kg) ♥♣ 15 LT 12 cwt (15,850 kg)  • 1st coupled ♠ 14 LT 19 cwt (15,190 kg) ♥♣ 14 LT 14 cwt (14,940 kg)  • 2nd coupled ♠ 15 LT (15,240 kg) ♥♣ 15 LT 16 cwt (16,050 kg)  • 3rd coupled ♠ 14 LT 19 cwt (15,190 kg) ♥♣ 15 LT 2 cwt (15,340 kg)  • 4th coupled ♠ 14 LT 19 cwt (15,190 kg) ♥ ♣ 14 LT 18 cwt (15,140 kg)  • Trailing ♠ 11 LT 7 cwt (11,530 kg) ♥♣ 10 LT 19 cwt (11,130 kg)  • Tender bogie Bogie 1: 27 LT 10 cwt (27,940 kg) Bogie 2: 23 LT 11 cwt (23,930 kg)  • Tender axle 13 LT 15 cwt (13,970 kg) Adhesive weight ♠ 59 LT 17 cwt (60,810 kg) ♥♣ 60 LT 10 cwt (61,470 kg) Loco weight ♠ 85 LT 10 cwt (86,870 kg) ♥♣ 87 LT 6 cwt (88,700 kg) Tender weight 51 LT 1 cwt (51,870 kg) Total weight ♠ 136 LT 11 cwt (138,700 kg) ♥♣ 138 LT 7 cwt (140,600 kg) Tender type MP1 (2-axle bogies) MP, MP1, MR, MS, MT, MT1, MT2, MX, MY, MY1 permitted Fuel type Coal Fuel capacity 10 LT (10.2 t) Water cap 4,250 imp gal (19,300 l) Generator Pyle National turbo Firebox type ♠ Belpaire - ♥ Round-top  • Firegrate area 37 sq ft (3.4 m2) Boiler: ​  • Model Watson Standard no. 2  • Pitch ♠ 7 ft 7 in (2,311 mm) ♥ 8 ft 1⁄2 in (2,451 mm)  • Diameter ♠ 5 ft 1 5⁄8 in (1,565 mm) ♥ 5 ft 7 1⁄2 in (1,714 mm)  • Tube plates ♠ 19 ft (5,791 mm) ♥♣ 19 ft 4 in (5,893 mm) ♥♦ 19 ft 3 5⁄8 in (5,883 mm)  • Small tubes ♠ 119: 2 1⁄4 in (57 mm) ♥ 87: 2 1⁄2 in (64 mm)  • Large tubes ♠ 21: 5 1⁄2 in (140 mm) ♥ 30: 5 1⁄2 in (140 mm) Boiler pressure ♠ 180 psi (1,241 kPa) ♥ 190 psi (1,310 kPa) Safety valve ♠ Ramsbottom - ♥ Pop Heating surface ♠ 2,059 sq ft (191.3 m2) ♥ 2,075 sq ft (192.8 m2)  • Tubes ♠ 1,909 sq ft (177.4 m2) ♥ 1,933 sq ft (179.6 m2)  • Firebox ♠ 150 sq ft (14 m2) ♥ 142 sq ft (13.2 m2) Superheater: ​  • Heating area ♠ 483 sq ft (44.9 m2) ♥ 492 sq ft (45.7 m2) Cylinders Two Cylinder size 21 in (533 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 ♠ 32,250 lbf (143.5 kN) @ 75% ♥ 37,360 lbf (166.2 kN) @ 75%
Career Operators South African Railways Class Class 14A & 14R Number in class 41 Numbers 1576-1595, 1901-1921 Delivered 1914-1915 First run 1914
The leading coupled axle had flangeless wheels

The South African Railways Class 14A 4-8-2 of 1914 was a steam locomotive.

In 1914 and 1915, the South African Railways placed 41 Class 14A steam locomotives with a 4-8-2 Mountain type wheel arrangement in service. It was a lighter version of the Class 14 which had entered service a year earlier.

Following the success of the Class 14, D.A. Hendrie, Chief Mechanical Engineer (CME) of the South African Railways (SAR), used its design as basis for the lighter Class 14A locomotive for use on coastal lines, particularly the Cape Eastern line from East London where the physical conditions were approximately similar to those of the lower sections of the Natal mainline, but the permanent way was not as heavy. This second version of the Class 14 was ordered from the North British Locomotive Company in 1913 and was built in two batches. Twenty were delivered in 1914, numbered in the range from 1576 to 1595, and another 21 in 1914 and 1915, numbered in the range from 1901 to 1921.

Like the Class 14, the Class 14A had piston valves, Walschaerts valve gear, a Belpaire firebox and was superheated, but it had nearly 6 inches (152 millimetres) less boiler diameter than the Class 14 to reduce the axle loading from 16 long tons 3 hundredweight (16,410 kilograms) to 15 long tons (15,240 kilograms). To compensate for the smaller boilers, they were equipped with smaller cylinders with a bore of 21 inches (533 millimetres) instead of 22 inches (560 millimetres).

The locomotives were erected at the East London workshops. Apart from their boilers and cylinders, the frame and other important components were standard with those of the Class 14, such as the coupled wheels, bogie, Pyle National turbo-generators and headlamps, Hasler speed indicator, sight feed lubricators, Hendrie's steam reversing gear, steam operation for rocking the firegrate, Gresham and Craven injectors, steam brakes and combination vacuum ejectors. It was also delivered with Type MP1 tenders which had a coal capacity of 10 long tons (10.2 tonnes) and a water capacity of 4,250 imperial gallons (19,300 litres). One noticeable visible difference from the Class 14 was the absence of the two large sandboxes on each running board.

During the 1930s, many serving locomotives were reboilered with a standard boiler type designed by then CME A.G. Watson as part of his standardisation policy. Such Watson Standard reboilered locomotives were reclassified by adding an "R" suffix to their classification.