South African type MR tender

South African type MR tender

Type MR on SAR Class 12R, 1979
Type and origin
Locomotive Class 12, Class 12A, Class 12B, Class 14A, Class 14B, Class 15, Class 15A, Class 16, Class 16A, Class 16B, Class 16C
Designer South African Railways
Builder South African Railways
In service c. 1930
Rebuilt from Type MP1
Specifications
Configuration 2-axle bogies
Gauge 3 ft 6 in (1,067 mm) Cape gauge
Length 25 ft 10 38 in (7,884 mm) no. 1494-1519, 1746-1760
25 ft 10 34 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 14 cwt (13,920 kg)
  Front bogie 24 LT 19 cwt (25,350 kg)
  Rear bogie 27 LT 8 cwt (27,840 kg)
Weight empty 48,864 lb (22,164 kg)
Weight w/o 52 LT 7 cwt (53,190 kg)
Fuel type Coal
Fuel cap. 10 LT (10.2 t)
Water cap. 4,600 imp gal (20,900 l)
Stoking Manual
Couplers Drawbar & Bell link-and-pin
Drawbar & AAR knuckle (1950s)
Career
Operators South African Railways
Numbers SAR 790-841, 851-852, 1494-1550, 1561-1595, 1746-1760, 1781-1828, 1839-1878, 1901-1921, 1931-1970, 2011-2025, 2080-2100, 2103-2138

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

Type MR tenders were rebuilt from Type MP1 tenders, which had entered service between 1912 and 1920. The rebuilding resulted in a tender with a larger water tank, but the same coal capacity.[1][2]

Origin

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 (SAR) in that year. They were built by North British Locomotive Company and Beyer, Peacock and Company.[1][2][3]

More Type MP1 tenders, from which the Type MR would later be rebuilt, entered service from 1913 to 1920, as tenders to the Classes 12A, 12B, 14A, 14B, 15, 15A, 16, 16A, 16B and 16C. These locomotives and tenders were built by Baldwin Locomotive Works, Beyer, Peacock and Company, Henschel and Son, J.A. Maffei and North British Locomotive Company.[1][2]

Other locomotives which were delivered new with Type MP1 tenders, were the Classes 14, MC1, MH and MJ.[1][2]

Rebuilding

In the 1930s, several of the Type MP1 tenders were rebuilt by the SAR, by mounting a completely new upper structure, with a larger water tank, on the existing underframe. The water capacity was increased from 4,250 to 4,600 imperial gallons (19,300 to 20,900 litres). These rebuilt tenders had a more modern appearance, with smooth sides all the way to the top.[1][2]

Letter codes

Since many tender types are interchangeable between different locomotive classes and types, a tender classification system was adopted by the SAR. These rebuilt tenders were designated Type MR.[2]

The first letter of the tender type indicates the classes of engines to which it can be coupled. The "M_" tenders could be used with the locomotive classes as shown below, although engine drawbars and intermediate emergency chains had to be replaced or adjusted to suit the target locomotive in some cases.[2]

The second letter indicates the tender's water capacity. The "_R" tenders had a capacity of 4,600 imperial gallons (20,900 litres).[2]

A number, when added after the letter code, indicates differences between similar tender types, such as wheelbase or coal bunker capacity.[2]

References

  1. 1 2 3 4 5 South African Railways & Harbours/Suid Afrikaanse Spoorweë en Hawens (15 Aug 1941). Locomotive Diagram Book/Lokomotiefdiagramboek, 3'6" Gauge/Spoorwydte. SAR/SAS Mechanical Department/Werktuigkundige Dept. Drawing Office/Tekenkantoor, Pretoria. p. 42.
  2. 1 2 3 4 5 6 7 8 9 South African Railways & Harbours/Suid Afrikaanse Spoorweë en Hawens (15 Aug 1941). Locomotive Diagram Book/Lokomotiefdiagramboek, 2'0" & 3'6" Gauge/Spoorwydte, Steam Locomotives/Stoomlokomotiewe. SAR/SAS Mechanical Department/Werktuigkundige Dept. Drawing Office/Tekenkantoor, Pretoria. pp. 6a-7a, 42.
  3. Holland, D.F. (1972). Steam Locomotives of the South African Railways, Volume 2: 1910-1955 (1st ed.). Newton Abbott, Devon: David & Charles. pp. 20–21, 24–27, 30, 34, 38–41. ISBN 978-0-7153-5427-8.
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