South African type MP1 tender

South African type MP1 tender

Type MP1 tender on SAR Class 15A, c. 1930

Type and origin Locomotive Class 12, Class 12A, Class 12B, Class 14, Class 14A, Class 14B, Class 15, Class 15A, Class 16, Class 16A, Class 16B, Class 16C, Class 20, Class MC1, Class MH, Class MJ Designer South African Railways (D.A. Hendrie) Builder Baldwin Locomotive Works Beyer, Peacock and Company Henschel & Son J.A. Maffei North British Locomotive Company Robert Stephenson and Company Vulcan Foundry In service 1912-1925 Rebuilder South African Railways Rebuild date c. 1930 Rebuilt to Type MR, Type XP1

Specifications Configuration 2-axle bogies Gauge 3 ft 6 in (1,067 mm) Cape gauge Length 25 ft 10 3⁄8 in (7,884 mm) no. 1494-1519, 1746-1760 25 ft 10 3⁄4 in (7,893 mm) all others Wheel dia. 34 in (864 mm) Wheelbase 16 ft 9 in (5,105 mm)  • Bogie 4 ft 7 in (1,397 mm) Axle load 13 LT 15 cwt (13,970 kg)  • Front bogie 27 LT 10 cwt (27,940 kg)  • Rear bogie 23 LT 11 cwt (23,930 kg) Weight empty 49,452 lb (22,431 kg) Weight w/o 51 LT 1 cwt (51,870 kg) Fuel type Coal Fuel cap. 10 LT (10.2 t) Water cap. 4,250 imp gal (19,300 l) Stoking Manual Couplers Drawbar & Johnston link-and-pin Drawbar & AAR knuckle (1930s)

Career Operators South African Railways Numbers SAR 790-841, 851-852, 1494-1550, 1561-1595, 1634-1648, 1651-1665, 1674-1681, 1701-1760, 1781-1828, 1839-1878, 1901-1921, 1931-1970, 2011-2025, 2080-2100, 2103-2138

The South African type MP1 tender was a steam locomotive tender.

The Type MP1 tender first entered service in 1912, as tenders to the Class 12 4-8-2 Mountain type steam locomotives which were acquired by the South African Railways in that year.

Type MP1 tenders were built between 1912 and 1925 by Baldwin Locomotive Works, Beyer, Peacock and Company, Henschel & Son, J.A. Maffei, North British Locomotive Company, Robert Stephenson and Company and Vulcan Foundry.

The South African Railways (SAR) placed 46 Class 12 Mountain type locomotives in service between 1912 and 1921. The locomotive and tender were designed by D.A. Hendrie, who had been appointed as the first Chief Mechanical Engineer of the SAR upon its inception in 1910. The Class 12 was the first locomotive design to originate from the newly established SAR and was acquired to haul coal between Germiston and Witbank. The Type MP1 first entered service as tenders to these locomotives.

The Type MP1 was the first of a standard tender type which, by fitting an engine drawbar to suit the class of engine to which it is coupled, was eventually to be used on all the Hendrie-designed locomotives. The tender had a coal capacity of 10 long tons (10.2 tonnes), a water capacity of 4,250 imperial gallons (19,300 litres) and a maximum axle load of 13 long tons 15 hundredweight (13,970 kilograms).

Sixteen locomotive classes, built by seven manufacturers, were delivered new with Type MP1 tenders, which were numbered for their engines in the number ranges as shown. An oval number plate, bearing the engine number and often also the tender type, was attached to the rear end of the tender.

Since many tender types are interchangeable between different locomotive classes and types, a tender classification system was adopted by the SAR. The first letter of the tender type indicates the classes of engines to which it could be coupled. The "M_" tenders could be used with the locomotive classes as shown, although engine drawbars and intermediate emergency chains had to be replaced or adjusted to suit the target locomotive in some cases.