Whyte notation
Whyte notation is a classification method for steam locomotives, and some internal combustion locomotives and electric locomotives, by wheel arrangement. It was devised by Frederick Methvan Whyte, and came into use in the early twentieth cen ...
wheel arrangement
In rail transport, a wheel arrangement or wheel configuration is a system of classifying the way in which wheels are distributed under a locomotive. Several notations exist to describe the wheel assemblies of a locomotive by type, position, and c ...
articulated locomotive
An articulated locomotive is a steam locomotive (rarely, an electric locomotive) with one or more engine units that can move independent of the main frame. Articulation allows the operation of locomotives that would otherwise be too large to neg ...
. The wheel arrangement is effectively two 4-4-2 locomotives operating back to back, with each power unit having four
leading wheel
The leading wheel or leading axle or pilot wheel of a steam locomotive is an unpowered wheel or axle located in front of the driving wheels. The axle or axles of the leading wheels are normally located on a leading truck. Leading wheels are used ...
s on two axles in a leading bogie, four powered and coupled driving wheels on two axles, and two
trailing wheel
On a steam locomotive, a trailing wheel or trailing axle is generally an unpowered wheel or axle ( wheelset) located behind the driving wheels. The axle of the trailing wheels is usually located in a trailing truck. On some large locomotives, ...
s on one axle in a
trailing truck
On a steam locomotive, a trailing wheel or trailing axle is generally an unpowered wheel or axle ( wheelset) located behind the driving wheels. The axle of the trailing wheels is usually located in a trailing truck. On some large locomotives, ...
. Since the 4-4-2 type is usually known as an Atlantic, the corresponding Garratt type is often referred to as a Double Atlantic.
Overview
The was not a common Garratt wheel arrangement. Only ten were built, all by Beyer, Peacock & Company, the owner of the Garratt patent.
Usage
Argentina
Eight locomotives were built for Argentina to run on .
* Five were built for the
Entre Ríos Railway
The Entre Ríos Railway (ERR) (in Spanish: Ferrocarril Entre Ríos) was a British-owned railway company that built and operated a railway network in Entre Ríos Province, between the rivers Uruguay and Paraná, in Argentina.
History
The compa ...
in 1927.
* Another three were built for the
Argentine North Eastern Railway
The Argentine North Eastern Railway (ANER) (in Spanish: Ferrocarril Nordeste Argentino, also Ferrocarril del Nord-Este Argentino) was a British-owned railway company, founded in 1887, that operated a railway network in the provinces of Entre R ...
in 1930.
After nationalization in 1948, all these locomotives were rostered on the
General Urquiza Railway
The General Urquiza Railway (FCGU) (in Spanish: Ferrocarril General Urquiza), named after the Argentine general and politician Justo José de Urquiza, is a standard gauge railway of Argentina which runs approximately northwards from Buenos Aire ...
.
Australia
The first Garratt locomotives to be built to the wheel arrangement were a pair of M class passenger locomotives for the gauge
Tasmanian Government Railways
The Tasmanian Government Railways (TGR) was the former operator of the mainline railways in Tasmania, Australia. Formed in 1872, the railway company was managed by the Government of Tasmania, and existed until absorption into the Australian Na ...
in Australia in 1912. They were acquired to haul express passenger trains between Launceston and Hobart.A Brief History of the Garratt Locomotive in Australia ''
Australian Railway Historical Society Bulletin
''Australian Railway History'' is a monthly magazine covering railway history in Australia, published by the New South Wales Division of the Australian Railway Historical Society on behalf of its state and territory Divisions.R class in 1924 and scrapped in the late 1940s.