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2-4-0+0-4-2 (Double Porter)
Diagram of one small leading wheel, four large driving wheels in two pairs, each pair joined by coupling rods, and one small trailing wheel
Equivalent classifications
UIC class1B+B1, 1’B+B1’
French class120+021
Turkish class23+23
Swiss class2/3+2/3, 4/6 from the 1920s
Russian class1-2-0+0-2-1
First known tank engine version
First use1915
LocomotiveQ class
RailwaySão Paulo Railway
DesignerBeyer, Peacock and Company
BuilderBeyer, Peacock and Company
Evolved from0-4-0+0-4-0

Under the Whyte notation for the classification of steam locomotives by wheel arrangement, 2-4-0+0-4-2 is an articulated locomotive, usually of the Garratt type. The wheel arrangement is effectively two 2-4-0 locomotives operating back to back, with the boiler and cab suspended between the two power units. Each power unit has two leading wheels on one axle, four powered and coupled driving wheels on two axles and no trailing wheels. Since the 2-4-0 type is sometimes known as a Porter, the corresponding Garratt type would be referred to as a Double Porter. A similar wheel arrangement exists for Mallet locomotives, but is referred to as 2-4-4-2.


This was the second rarest Garratt wheel arrangement. Only five locomotives were constructed to this arrangement, four of which were built by Beyer, Peacock and Company (BP).[1][2]

The four BP locomotives comprised three for the 5 ft 3 in (1,600 mm) São Paulo Railway of Brazil in 1915, and one for the 2 ft 6 in (762 mm) gauge Ceylon Government Railway (CGR) in 1929, the CGR's class H1.[1]

One more was built in 1919 by the São Paulo Railway, for its own use on 1,000 mm (3 ft 3 38 in) metre gauge.[2]

2-4-0+0-4-2 Garratt production list – All manufacturers[1][2]
Gauge Railway Class Works no. Units Year Builder
2 ft 6 in Ceylon Government Railway H1 6629 1 1929 Beyer, Peacock
1,000 mm São Paulo Railway, Brazil 1 1919 São Paulo Railway
5 ft 3 in São Paulo Railway, Brazil Q 5892-5894 3 1915 Beyer, Peacock




The single class H1 Garratt entered service on the Ceylon Government Railways in 1931. It was used in mixed traffic working on the Uda Pussellawa railway. Until the 1960s, the locomotive was occasionally operated on the Kelani Valley Line. It was withdrawn from service in 1972 and was scrapped in 1981.[3]


  1. ^ a b c Hamilton, Gavin N., The Garratt Locomotive - Garratt Locomotives produced by Beyer, Peacock, retrieved 10 November 2012
  2. ^ a b c Hamilton, Gavin N., The Garratt Locomotive - Garratt Locomotives from Other Builders, retrieved 10 November 2012
  3. ^ Rail 2000. Sri Lanka: Sri Lanka Railway. p. 42.