South African type CZ tender

South African type CZ tender

Type CZ tender no. 3480, 17 September 2009

Type and origin Locomotive Class 25 Designer South African Railways (L.C. Grubb) Henschel and Son Builder Henschel and Son North British Locomotive Company South African Railways Works no. Henschel 23780, 28780-28839, NBL 27372-27400, SAR 3541 In service 1953-1954, 1963 Rebuilder South African Railways Rebuild date 1973-1980 Rebuilt to Type EW2

Specifications Configuration 3-axle bogies Gauge 3 ft 6 in (1,067 mm) Cape gauge Wheel dia. 34 in (864 mm) Wheelbase 45 ft 10 in (13,970 mm)  • Bogie 10 ft (3,048 mm) Axle load 19 LT 1 cwt 2 qtr (19,380 kg)  • Front bogie 57 LT 4 cwt (58,120 kg)  • Rear bogie 56 LT 14 cwt (57,610 kg) Weight empty 158,339 lb (71,821 kg) Weight w/o 113 LT 18 cwt (115,700 kg) Fuel type Coal Fuel cap. 19 LT (19.3 t) Water cap. 4,400 imp gal (20,000 l) main tank 600 imp gal (2,730 l) condensate Stoking Mechanical Couplers Drawbar & AAR knuckle

Career Operators South African Railways Numbers SAR 3451-3541

The South African type CZ tender was a condensing steam locomotive tender.

Type CZ tenders entered service between 1953 and 1955, as tenders to the Class 25 4-8-4 Northern type condensing steam locomotives which entered service on the South African Railways in those years. One more tender was built by the Railways in 1963.

Altogether 91 Type CZ tenders were built in 1953 and 1963 by Henschel and Son, North British Locomotive Company (NBL) and the South African Railways (SAR).

Between 1953 and 1955, the SAR placed ninety Class 25 condensing steam locomotives in service, designed under the direction of L.C. Grubb, Chief Mechanical Engineer of the SAR from 1949 to 1954.

The design work on the locomotive's condensing apparatus and the Type CZ condensing tender was carried out by Henschel, who built one locomotive complete with tender, no. 3451 with works number 28730. This locomotive was then dispatched to NBL in Glasgow, who built the rest of the Class 25 locomotives, numbered in the range from 3452 to 3540. They were delivered between 1953 and 1955.

Apart from the first engine and tender, another 60 tenders were built by Henschel, who held the patent, with works numbers in the range from 28780 to 28839. Another 29 tenders were built by NBL, who also built 89 of the 90 engines. The works numbers of these NBL-built tenders probably corresponded with the works numbers of the last 29 engines, in the range from 27372 to 27400, but this cannot be verified. One more tender was built by the SAR at its Salt River shops in 1963, on a spare cast water-bottom frame which had been delivered as part of the original order in 1953.

On the Class 25 condensing locomotive, spent steam was fed through a thick pipe on the engine's left side back to the tender, to be condensed back to water for repeated use. The Type CZ tender was built on a one-piece cast-steel water-bottom frame, supplied by General Steel Castings in the United States of America, and rode on three-axle bogies with roller bearings. It had four 21 inches (533 millimetres) diameter vacuum brake cylinders and the brake riggings of its bogies were independent of each other. Only the front bogie was equipped with a hand brake.