South African Class 19B 4-8-2

South African Class 19B & 19BR 4-8-2

No. 1412 taking water at Blouwater, c. 2001

Type and origin ♠ Class 19B as built with a round-topped firebox ♥ Class 19BR rebuilt with a Watson Standard boiler ♣ Type MT tender - ♦ Type MP1 tender Power type Steam Designer South African Railways (Col F.R. Collins DSO) Builder Berliner Maschinenbau Serial number 9827-9840 Model Class 19B Build date 1930 Total produced 14

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. 54 in (1,372 mm) Trailing dia. 34 in (864 mm) Tender wheels ♣♦ 34 in (864 mm) Wheelbase ♦ 58 ft 8 3⁄4 in (17,901 mm)  • Engine 32 ft 3 in (9,830 mm)  • Leading 6 ft 4 in (1,930 mm)  • Coupled 14 ft 5 in (4,394 mm)  • Tender ♣ 20 ft 5 in (6,223 mm) ♦ 16 ft 9 in (5,105 mm)  • Tender bogie ♣ 6 ft 2 in (1,880 mm) ♦ 4 ft 7 in (1,397 mm) Wheel spacing (Asymmetrical) 1-2: 4 ft 10 in (1,473 mm) 2-3: 4 ft 9 in (1,448 mm) 3-4: 4 ft 10 in (1,473 mm) Length: ​  • Over couplers ♦ 67 ft 3 1⁄2 in (20,510 mm) Height ♠ 12 ft 10 in (3,912 mm) ♥ 12 ft 10 7⁄8 in (3,934 mm) Frame type Bar Axle load ♠ 13 LT 16 cwt (14,020 kg) ♥ 13 LT 6 cwt (13,510 kg)  • Leading 14 LT 4 cwt (14,430 kg)  • 1st coupled 12 LT 15 cwt (12,950 kg)  • 2nd coupled 12 LT 16 cwt (13,010 kg)  • 3rd coupled 12 LT 19 cwt (13,160 kg)  • 4th coupled 12 LT 14 cwt (12,900 kg)  • Trailing ♠ 13 LT 16 cwt (14,020 kg) ♥ 13 LT 6 cwt (13,510 kg)  • Tender bogie Bogie 1: ♣ 32 LT 18 cwt (33,430 kg) ♦ 27 LT 10 cwt (27,940 kg) Bogie 2: ♣ 33 LT 2 cwt (33,630 kg) ♦ 23 LT 11 cwt (23,930 kg)  • Tender axle ♣ 16 LT 11 cwt (16,820 kg) ♦ 13 LT 15 cwt (13,970 kg) Adhesive weight 51 LT 4 cwt (52,020 kg) Loco weight 78 LT 14 cwt (79,960 kg) Tender weight ♣ 66 LT (67,060 kg) ♦ 51 LT 1 cwt (51,870 kg) Total weight ♣ 144 LT 14 cwt (147,000 kg) ♦ 129 LT 15 cwt (131,800 kg) Tender type MT (2-axle bogies) MP1 (2-axle bogies) MP, MP1, MR, MT, MX, MY, MY1 permitted Fuel type Coal Fuel capacity ♣ 12 LT (12.2 t) ♦ 10 LT (10.2 t) Water cap ♣ 6,000 imp gal (27,300 l) ♦ 4,250 imp gal (19,300 l) Firebox type Round-top  • Firegrate area ♠ 37 sq ft (3.4 m2) ♥ 36 sq ft (3.3 m2) Boiler: ​  • Model Watson Standard no. 1A  • Pitch 8 ft (2,438 mm)  • Diameter 5 ft (1,524 mm)  • Tube plates 20 ft 2 in (6,147 mm)  • Small tubes ♠ 120: 2 1⁄4 in (57 mm) ♥ 76: 2 1⁄2 in (64 mm)  • Large tubes ♠ 21: 5 1⁄2 in (140 mm) ♥ 24: 5 1⁄2 in (140 mm) Boiler pressure 200 psi (1,379 kPa) Safety valve Pop Heating surface ♠ 2,176 sq ft (202.2 m2) ♥ 1,839 sq ft (170.8 m2)  • Tubes ♠ 2,036 sq ft (189.2 m2) ♥ 1,700 sq ft (160 m2)  • Arch tubes ♠ 13 sq ft (1.2 m2) ♥ 16 sq ft (1.5 m2)  • Firebox ♠ 127 sq ft (11.8 m2) ♥ 123 sq ft (11.4 m2) Superheater: ​  • Heating area ♠ 506 sq ft (47.0 m2) ♥ 404 sq ft (37.5 m2) Cylinders Two Cylinder size 21 in (533 mm) bore 26 in (660 mm) stroke Valve gear Walschaerts (No. 1401–1413) Caprotti (No. 1414) Valve type Piston Couplers AAR knuckle

Performance figures Tractive effort 31,850 lbf (141.7 kN) @ 75%

Career Operators South African Railways Class Class 19B, 19BR Number in class 14 Numbers 1401–1414 Nicknames Baby Delivered 1930 First run 1930 Withdrawn c. 1977

The South African Railways Class 19B 4-8-2 of 1930 was a steam locomotive.

In 1930, the South African Railways placed fourteen Class 19B steam locomotives with a 4-8-2 Mountain type wheel arrangement in service. One of them was later reboilered and reclassified to Class 19BR.

Fourteen Class 19B 4-8-2 Mountain type steam locomotives were built in Germany by Berliner Maschinenbau AG and were delivered in 1930. All but one were built with Walschaerts valve gear.

The South African Class 19B, numbered in the range from 1401 to 1414, was a later model of the original Class 19 which had been designed in 1928 under the supervision of Colonel F.R. Collins DSO, Chief Mechanical Engineer (CME) of the SAR from 1922 to 1929. It was virtually identical to the Class 19 apart from the wheelbase of the front bogie which had been increased from 6 feet 2 inches (1,880 millimetres) to 6 feet 4 inches (1,930 millimetres) to improve the clearance between the cylinders and the bogie wheels, since the bogie wheels of predecessors Classes 19 and 19A fouled the cylinder covers on sharp curves. The longer wheelbase bogie also facilitated the removal of cylinder covers at running sheds. Because of this difference, the new engines were designated Class 19B.

The first thirteen Class 19B locomotives were delivered with Walschaerts valve gear, but like Class 16DA no. 879 of the same year, no. 1414 was equipped with Caprotti valve gear as an experiment. In January 1943, after thirteen years in service, the Caprotti rotary cam poppet valve gear was removed at the Uitenhage workshops and replaced with Walschaerts valve gear. The experiment did result in the successor Class 19C being built with rotary cam poppet valve gear.

The trailing bissel truck was constructed with three holes to enable the compensating beam to be fitted at three locations, which enabled it to be used to redistribute the engine's weight on the trailing axle. The axle load weights as shown for the Class 19B are with the trailing truck compensating beam pin in the rearmost of the three holes. The axle load weights as shown for the Class 19BR are also with the trailing truck compensating beam pin in the rearmost of the three holes.