CGR 4th Class 4-6-0TT 1880

CGR 4th Class 4-6-0TT 1880 South African Class 04 4-6-0TT 1880
No. E29 on a passenger train, c. 1886
Type and origin Power type Steam Designer Cape Government Railways (Michael Stephens) Builder Robert Stephenson and Company Serial number 2361-2366, 2385-2390, 2431-2436 Build date 1879-1880 Total produced 18
Specifications Configuration: ​  • Whyte 4-6-0TT (Tenwheeler)  • UIC 2'Cn2t Driver 2nd coupled axle Gauge 3 ft 6 in (1,067 mm) Cape gauge Leading dia. 27+1⁄2 in (698 mm) Coupled dia. Eastern: 38 in (965 mm) Midland: 42 in (1,067 mm) Tender wheels 36 in (914 mm) Wheelbase 35 ft 2+7⁄8 in (10,741 mm) ​  • Engine 17 ft (5,182 mm)  • Leading 5 ft (1,524 mm)  • Coupled 8 ft (2,438 mm)  • Tender 8 ft (2,438 mm) Length: ​  • Over couplers 43 ft 4+7⁄8 in (13,230 mm) Height Eastern: 12 ft 1 in (3,683 mm) Midland: 12 ft (3,658 mm) Axle load 8 LT 14 cwt (8,840 kg) ​  • Leading 8 LT 16 cwt (8,941 kg)  • 1st coupled 7 LT 13 cwt (7,773 kg)  • 2nd coupled 8 LT 14 cwt (8,840 kg)  • 3rd coupled 7 LT 11 cwt (7,671 kg)  • Tender axle Axle 1: 8 LT 14 cwt (8,840 kg) Axle 2: 6 LT 17 cwt (6,960 kg) Axle 3: 7 LT 11 cwt (7,671 kg) Adhesive weight 23 LT 18 cwt (24,280 kg) Loco weight 32 LT 14 cwt (33,220 kg) Tender weight 23 LT 2 cwt (23,470 kg) Total weight 55 LT 16 cwt (56,700 kg) Tender type 3-axle Fuel type Coal Fuel capacity 6 LT (6.1 t) Water cap. 600 imp gal (2,730 L) engine Tender cap. 1,675 imp gal (7,610 L) Firebox: ​  • Type Round-top  • Grate area Regular: 11.7 sq ft (1.09 m2) Tilney: 10.9 sq ft (1.01 m2) Boiler: ​  • Pitch Eastern: 5 ft 9 in (1,753 mm) Midland: 5 ft 11 in (1,803 mm)  • Diameter 3 ft 6 in (1,067 mm) inside 4 ft 2 in (1,270 mm) outside  • Tube plates 10 ft 1 in (3,073 mm)  • Small tubes 145: 1+3⁄4 in (44 mm) Boiler pressure 140 psi (965 kPa) Safety valve Salter Heating surface: ​  • Firebox 65 sq ft (6.0 m2)  • Tubes 688 sq ft (63.9 m2)  • Total surface 753 sq ft (70.0 m2) Cylinders Two Cylinder size 15 in (381 mm) bore 20 in (508 mm) stroke Valve gear Stephenson Couplers Johnston link-and-pin
Performance figures Tractive effort 11,250 lbf (50.0 kN) @ 75%
Career Operators Cape Government Railways South African Railways Class CGR 4th Class, SAR Class 04 Number in class 18 Numbers M34-M39, M50-M55, E27-E32 Delivered 1880-1881 First run 1880

The Cape Government Railways 4th Class 4-6-0TT of 1880 was a South African steam locomotive from the pre-Union era in the Cape of Good Hope.

In 1880 and 1881, the Cape Government Railways placed eighteen 4th Class 4-6-0 tank-and-tender locomotives in mainline service on its Midland and Eastern Systems, working out of Port Elizabeth and East London respectively. It was the first South African locomotive to be built to a local design. Four of these locomotives were still in service to come onto the South African Railways roster in 1912.^[1]