4-6-4+4-6-4

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A 15th class 4-6-4+4-6-4 Garratt of the Rhodesian Railways in 1964.

A 4-6-4+4-6-4, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a Garratt articulated locomotive.

Other equivalent classifications are:
UIC classification: 2C2+2C2 (also known as German classification and Italian classification)
French classification: 232+232
Turkish classification: 37+37
Swiss classification: 3/7+3/7

The wheel arrangement is effectively two 4-6-4 ("Baltic" or "Hudson") locomotives operating back to back. The type is thus sometimes called a Double Baltic or "Double Hudson".

This was the fifth most common Garratt arrangement, with 84 examples constructed, 74 by Garratt patent owner Beyer, Peacock and ten by Belgian manufacturer Société Franco-Belge de Materiel de Chemins de Fer under sub-contract from Beyer, Peacock in 1952. Only two railway systems used this arrangement; these were the Sudan Railways with ten examples of the 250 class, and Rhodesia Railways, who owned 74, split between 44 of the 15th class and thirty of the 15A class.^[1]

[edit] References

^ Gavin Hamilton. Garratt Locomotives produced by Beyer Peacock. The Garratt Locomotive. Retrieved on 2008-01-12.

v • d • e Steam locomotive types

Single engine types	0-2-2 • 2-2-0 • 2-2-2 • 2-2-4 • 4-2-0 • 4-2-2 • 4-2-4 • 6-2-0 0-3-0 0-4-0 • 0-4-2 • 0-4-4 • 2-4-0 • 2-4-2 • 2-4-4 • 4-4-0 • 4-4-2 • 4-4-4 • 4-4-6 0-6-0 • 0-6-2 • 0-6-4 • 2-6-0 • 2-6-2 • 2-6-4 • 2-6-6 • 4-6-0 • 4-6-2 • 4-6-4 0-8-0 • 0-8-2 • 0-8-4 • 2-8-0 • 2-8-2 • 2-8-4 • 2-8-6 • 4-8-0 • 4-8-2 • 4-8-4 • 4-8-6 • 6-8-6 0-10-0 • 0-10-2 • 2-10-0 • 2-10-2 • 2-10-4 • 4-10-0 • 4-10-2 0-12-0 • 2-12-0 • 2-12-2 • 2-12-4 • 4-12-2 • 4-14-4

Duplex engine types	4-4-4-4 • 6-4-4-6 • 4-4-6-4 • 4-6-4-4

Garratt (articulated) types	0-4-0+0-4-0 • 2-4-0+0-4-2 • 2-4-2+2-4-2 • 4-4-2+2-4-4 • 0-6-0+0-6-0 • 2-6-0+0-6-2 • 2-6-2+2-6-2 4-6-2+2-6-4 • 4-6-4+4-6-4 • 2-8-0+0-8-2 • 2-8-2+2-8-2 • 4-8-0+0-8-4 • 4-8-2+2-8-4 • 4-8-4+4-8-4

Mallet (articulated) types (includes Triplex)	0-4-4-0 • 0-4-4-2 • 2-4-4-2 0-6-6-0 • 2-6-6-0 • 2-6-6-2 • 2-6-6-4 • 2-6-6-6 • 2-6-8-0 • 4-6-6-2 • 4-6-6-4 0-8-8-0 • 2-8-8-0 • 2-8-8-2 • 2-8-8-4 • 4-8-8-2 • 4-8-8-4 2-10-10-2 • 2-8-8-8-2 • 2-8-8-8-4

Engerth (articulated) types	0-4-4 • 0-4-6 2-6-2 • 0-6-4 • 0-6-4-0 0-8-4 • 0-8-6