South African type ET1 tender

The South African type ET1 tender was a steam locomotive tender.

South African type ET1 tender
Type and origin
LocomotiveClass 15F
DesignerSouth African Railways
(M.M. Loubser)
BuilderSouth African Railways
In servicec. 1950
Rebuilt fromType ET
Specifications
Configuration2-axle bogies
Gauge3 ft 6 in (1,067 mm) Cape gauge
Length30 ft 9 7⁄16 in (9,384 mm)
Wheel dia.34 in (864 mm)
Wheelbase20 ft 5 in (6,223 mm)
 • Bogie6 ft 2 in (1,880 mm)
Fuel typeCoal
Fuel cap.16 LT (16.3 t)
Water cap.5,620 imp gal (25,500 l)
StokingMechanical
CouplersDrawbar & AAR knuckle
Career
OperatorsSouth African Railways
Main article: South African steam locomotive tenders

Type ET1 tenders were modified and reclassified Type ET tenders, which had entered service as tenders to Class 15F 4-8-2 Mountain type steam locomotives in 1947 and 1948. The modification resulted in a tender with a larger coal capacity, but the same water capacity.[1][2]

Origin

The Type ET tender first entered service in 1947, as tenders to the last batch of 100 Class 15F locomotives to enter service on the South African Railways (SAR). They were built by North British Locomotive Company to designs by Doctor M.M. Loubser, Chief Mechanical Engineer of the SAR from 1939 to 1949, and were equipped with mechanical stokers.[3][4][5]

Modification

During the 1950s, some of the Type ET tenders were modified to enlarge their coal bunkers from 14 to 16 long tons (14.2 to 16.3 tonnes) capacity. These modified tenders were designated Type ET1.[1][2]

Classification letters

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 can be coupled. The "E_" tenders were arranged with mechanical stokers and could be used with the locomotive classes as shown.[1][2]

The second letter indicates the tender's water capacity. The "_T" tenders had a capacity of between 5,587 and 6,000 imperial gallons (25,400 and 27,300 litres; 6,710 and 7,210 US gallons).[2]

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

References
  1. 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. pp. VIII, 46.
  2. 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. VIII, 6a-7a, 21-21A, 46.
  3. Holland, D. F. (1972). Steam Locomotives of the South African Railways. 2: 1910-1955 (1st ed.). Newton Abbott, Devon: David & Charles. pp. 97–98. ISBN 978-0-7153-5427-8.
  4. Espitalier, T.J.; Day, W.A.J. (1947). The Locomotive in South Africa - A Brief History of Railway Development. Chapter VII - South African Railways (Continued). South African Railways and Harbours Magazine, February 1947. pp. 129-131.
  5. Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 63–64. ISBN 0869772112.
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