South African type XM4 tender

South African type XM4 tender

Type XM4 tender on SAR Class MF
Type and origin
Locomotive SAR Class MF
Designer American Locomotive Company
Builder American Locomotive Company
In service 1911
Specifications
Configuration 2-axle bogies
Gauge 3 ft 6 in (1,067 mm) Cape gauge
Wheel dia. 30 in (762 mm)
Wheelbase 17 ft 10 in (5,436 mm)
  Bogie 5 ft 10 in (1,778 mm)
Axle load 12 LT 15 cwt (12,950 kg) average
  Bogie 25 LT 10 cwt (25,910 kg) average
Weight empty 51,840 lb (23,510 kg)
Weight w/o 51 LT (51,820 kg)
Fuel type Coal
Fuel cap. 10 LT (10.2 t)
Water cap. 4,000 imp gal (18,200 l)
Stoking Manual
Couplers Drawbar & Bell link-and-pin
Career
Operators South African Railways
Numbers SAR 1629-1633

The South African type XM4 tender was a steam locomotive tender.

Type XM4 tenders entered service in November 1911, as tenders to the second batch of 2-6-6-2 Superheated Mallet type steam locomotives which were delivered to the Central South African Railways in that year. These locomotives were designated Class MF on the South African Railways in 1912.[1][2][3]

Manufacturer

Type XM4 tenders were built in 1911 by the American Locomotive Company (ALCO).[1][2][3]

In Novemnber 1911, the Central South African Railways (CSAR) placed a second batch of five 2-6-6-2 Mallet articulated compound steam locomotives in service, built by ALCO. These locomotives were designated Class MF on the South African Railways (SAR) in 1912. The Type XM4 entered service as tenders to these five engines.[1][2][3]

Classification

Since many tender types are interchangeable between different locomotive classes and types, a tender classification system was adopted by the SAR and these tenders were designated Type XM4.[1][3]

In the SAR years, tenders were numbered for the engines they were delivered with. In most cases, an oval number plate, bearing the engine number and tender type, would be attached to the rear end of the tender.[3][4]

Only the second batch of five Class MF locomotives were delivered new with Type XM4 tenders. They were numbered in the range from 1629 to 1633, directly onto the SAR roster, marking the introduction of the SAR renumbering scheme under the Union programme.[2][3][4][5]

Letter codes

The first letter of the tender type indicates the classes of engines to which it can be coupled. The "X_" tenders could be used with the following locomotive classes:[3]

The second letter indicates the tender's water capacity. The "_M" tenders had a capacity of 4,000 imperial gallons (18,200 litres).[3]

A number, when added after the letter code, usually indicates differences between similar tender types, such as wheelbase or coal bunker capacity.[3]

References

  1. 1 2 3 4 Holland, D.F. (1972). Steam Locomotives of the South African Railways, Volume 2: 1910-1955 (1st ed.). Newton Abbott, Devon: David & Charles. pp. 16–19. ISBN 978-0-7153-5427-8.
  2. 1 2 3 4 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. 43.
  3. 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, 43.
  4. 1 2 Classification of S.A.R. Engines with Renumbering Lists, issued by the Chief Mechanical Engineer’s Office, Pretoria, January 1912 (Reprinted in April 1987 by SATS Museum, R.3125-6/9/11-1000)
  5. Espitalier, T.J.; Day, W.A.J. (1945). The Locomotive in South Africa - A Brief History of Railway Development. Chapter VII - South African Railways (Continued). South African Railways and Harbours Magazine, May 1945. p. 347.
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