South African type EW1 tender

South African type EW1 tender
Type EW1 tender off Class 25NC, 2009
Type and origin
LocomotiveClass 25NC
DesignerSouth African Railways
(L.C. Grubb)
BuilderNorth British Locomotive Company
Henschel and Son
Works no.NBL 27287-27296, 27311
Henschel 28731-28769
In service1953
Specifications
Configuration3-axle bogies
Gauge3 ft 6 in (1,067 mm) Cape gauge
Wheel dia.34 in (864 mm)
Wheelbase32 ft (9,754 mm)
 • Bogie10 ft (3,048 mm)
Axle load18 LT 1 cwt 2 qtr (18,370 kg)
 • Front bogie51 LT 6 cwt (52,120 kg)
 • Rear bogie54 LT 5 cwt (55,120 kg)
Weight empty97,300 lb (44,100 kg)
Weight w/o105 LT 11 cwt (107,200 kg)
Fuel typeCoal
Fuel cap.18 LT (18.3 t)
Water cap.10,500 imp gal (47,700 L)
StokingMechanical
CouplersDrawbar & AAR knuckle
Career
OperatorsSouth African Railways
NumbersSAR 3401-3450

The South African type EW1 tender was a steam locomotive tender.

Type EW1 tenders entered service between 1953 and 1955 as tenders to the Class 25NC 4-8-4 Northern type steam locomotives which entered service on the South African Railways in those years.[1][2]

Manufacturers

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Type EW1 tenders were built in 1953, eleven by North British Locomotive Company and 39 by Henschel and Son.[1]

The South African Railways (SAR) placed fifty Class 25NC locomotives in service between 1953 and 1955. The locomotive and tender were designed by L.C. Grubb, Chief Mechanical Engineer of the SAR from 1949 to 1954. It was the non-condensing version of the Class 25 condensing locomotive, of which ninety were placed in service at the same time.[1][3][4][5]

Characteristics

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The tender rode on six-wheeled bogies, each with a 10 feet (3,048 millimetres) wheelbase and fitted with Timken roller bearings. It was equipped with a mechanical stoker, of which the engine was mounted on the tender. The tank had a water capacity of 10,500 imperial gallons (47,700 litres) and the coal bunker a capacity of 18 long tons (18.3 tonnes). The tender had a one-piece steel casting water-bottom frame, with the frame itself forming the bottom of the tank instead of being a separate tank and frame as in previous designs. The casting was done by Commonwealth Steel Castings Corporation in the United States of America.[1][2][3]

Locomotive

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Only Class 25NC locomotives were delivered new with Type EW1 tenders, which were numbered in the range from 3401 to 3450 for their engines. An oval number plate, bearing the engine number and often also the locomotive class and tender type, was attached to the rear end of the tender.[1][3]

Classification letters

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

The second letter indicates the tender's water capacity. The "_W1" tenders had a capacity of 10,500 imperial gallons (47,700 litres; 12,600 US gallons).[2]

Modification

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Between 1979 and 1981, the last one of the Class 25NC locomotives, no. 3450, was rebuilt to the sole Class 26 Red Devil. The coal capacity of this locomotive's Type EW1 tender was increased from 18 long tons (18.3 tonnes) to approximately 20 long tons (20.3 tonnes) by raising the bunker sides. Since the water capacity remained unchanged, the tender was not reclassified.[6]

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

Illustration

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References

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  1. ^ a b c d e Holland, D. F. (1972). Steam Locomotives of the South African Railways. Vol. 2: 1910-1955 (1st ed.). Newton Abbott, England: David & Charles. p. 110. ISBN 978-0-7153-5427-8.
  2. ^ a b c d e 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, 20-21, 28-28A.
  3. ^ a b c Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 77–78. ISBN 0869772112.
  4. ^ North British Locomotive Company works list, compiled by Austrian locomotive historian Bernhard Schmeiser
  5. ^ Henschel-Lieferliste (Henschel & Son works list), compiled by Dietmar Stresow
  6. ^ South Africa's 'Red Devil' (Accessed on 28 July 2016)