TR GA class

The TR GA class, later known as the EAR 53 class, was a class of 1,000 mm (3 ft 3 3⁄8 in) gauge 4-8-2+2-8-4 Garratt-type articulated steam locomotives. The three members of the class were built in 1930 by Beyer, Peacock & Co. in Manchester, England, for the Tanganyika Railway (TR). They entered service in 1931, and, with one exception, were later operated by the TR's successor, the East African Railways (EAR).[2][3]

  • Tanganyika Railway GA class
  • East African Railways 53 class
Type and origin
Power typeSteam
BuilderBeyer, Peacock & Co.
Serial number6718–6720
Build date1930
Total produced3
Specifications
Configuration:
​
 • Whyte4-8-2+2-8-4 Garratt
 • UIC(2′D1′)(1′D2′) h4
Gauge1,000 mm (3 ft 3 3⁄8 in)
Driver dia.43 in (1,092 mm)
Adhesive weight83.8 long tons (85.1 t)
Loco weight138.3 long tons (140.5 t)
Fuel typeOil
Fuel capacity2,455 imp gal (11,160 l; 2,948 US gal)
Water cap4,925 imp gal (22,390 l; 5,915 US gal)
Firebox:
 • Firegrate area		43.6 sq ft (4.05 m2)
Boiler pressure
  • 170 psi (1.17 MPa)
  • (180 psi (1.24 MPa))
Heating surface2,430 sq ft (226 m2)
 • Tubes 
1,856 sq ft (172.4 m2)
 • Firebox194 sq ft (18.0 m2)
Superheater:
​
 • TypeInside
 • Heating area380 sq ft (35 m2)
Cylinders4
Cylinder size16.5 in × 22 in (419 mm × 559 mm)
Valve gearWalschaerts
Performance figures
Tractive effort42,600 lbf (189.49 kN)
Career
Operators
Class
  • TR GA class
  • EAR 53 class
Number in class3
Numbers
  • TR: 300–302
  •        700–702
  • EAR: 5301–5302
First run1931
[1]

Specifications

The design of the GA class locomotives was based upon that of the KUR EC2 class, which was built at about the same time by the North British Locomotive Company for the Kenya-Uganda Railway (KUR). The main design difference was that the GAs had higher, narrower front tanks than the EC2s. With their reduced water capacity, the GAs also had a lower axle loading, which made them suitable for operation over the World War I-damaged bridges on the Central Line.[3][4]

Service history

Upon entry into service in 1931, the GA class locomotives were allocated numbers 300–302.[4] Each of them was also given a name: the first two carried the names Arusha and Iringa, respectively, after the locations of the TR's big road depots, and no. 302 was named Bukoba, as that town had a jetty for marine services.[5] Later, the GAs were renumbered 700–702.[5]

It was the TR's general policy to allocate tender locomotives to standard duties, and use its Garratts only for the most demanding tasks. The GA class therefore normally worked between Dar-es-Salaam and Morogoro, the heaviest part of the Central Line.[3]

The GA class's operating costs were markedly lower than those of their predecessors. Even during the Great Depression, when traffic volumes greatly declined, they were of great operational benefit. Following the outbreak of World War II, they became indispensable.[4]

Unfortunately one member of the class, no 702 Bukoba, was derailed by a washaway near Mikese during a night of bad weather in 1944. The crew was saved, but the locomotive was almost completely submerged and had to be scrapped.[4]

In 1949, the TR and the KUR were merged to form the EAR, which took over the two survivors, classified them as its 53 class, and renumbered them 5301–5302.[5]

The EAR also equipped the two survivors with a French-style ACFI feedwater heater, one of which had already been fitted to the last member of the KUR EC1 class, no 66. However, the feedwater heaters were later removed, partly because they achieved only limited improvement in thermal efficiency, and also as they had caused similar maintenance problems to those experienced by the KUR.[5]

In the 1950s, the EAR 53 class locomotives were replaced on the Central Line by the new EAR 60 class locomotives, and therefore transferred to the northern part of the EAR system. Later, they returned to what had become Tanzania, to carry out transfer work in Dar-es-Salaam. They were withdrawn and scrapped there in the late 1960s.[3][5]

Class list

The numbers and names of each member of the class were as follows:[6][7]

Builder's
number		 First TR
number		 Second TR
number		 EAR
number		 Name Notes
6718 300 700 5301 Arusha
6719 301 701 5302 Iringa
6720 302 703 - Bukoba Scrapped 1944 following a derailment

See also

References

Notes
  1. Ramaer 1974, pp. 60–61, 62, 86.
  2. Ramaer 1974, pp. 60–49.
  3. Durrant 1981, p. 184.
  4. Ramaer 1974, p. 60.
  5. Ramaer 1974, p. 61.
  6. Ramaer 1974, p. 89.
  7. Durrant 1981, p. 189.

Bibliography
  • Durrant, A E (1981). Garratt Locomotives of the World (rev. and enl. ed.). Newton Abbot, Devon, UK; North Pomfret, Vt, USA: David & Charles. ISBN 0715376411.
  • Patience, Kevin (1976). Steam in East Africa: a pictorial history of the railways in East Africa, 1893-1976. Nairobi: Heinemann Educational Books (E.A.) Ltd. OCLC 3781370.
  • Ramaer, Roel (1974). Steam Locomotives of the East African Railways. David & Charles Locomotive Studies. Newton Abbot, Devon, UK; North Pomfret, Vt, USA: David & Charles. ISBN 0715364375.
  • Ramaer, Roel (2009). Gari la Moshi: Steam Locomotives of the East African Railways. Malmö, Sweden: Stenvalls. ISBN 9789172661721.

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