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Thus a 4-6-2-type Garratt is a 4-6-2+2-6-4. For Garratt locomotives, the plus sign is used even when there are no intermediate unpowered wheels, e.g. the LMS Garratt 2-6-0+0-6-2 . This is because the two engine units are more than just power bogies .
4-4-6 locomotive. A 4-4-6, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a locomotive with: four (4) leading wheels (at the front of the locomotive) four (4) driving wheels (2 axles) fixed in a rigid frame, and; six (6) trailing wheels (normally mounted in a trailing truck).
AT&SF locomotive no. 1300, a 4-4-6-2 Mallet type. Under the Whyte notation for the classification of steam locomotive wheel arrangements, a 4-4-6-2 is a locomotive with two pairs of leading wheels, one set of four driving wheels, a second set of six driving wheels, and a pair of trailing wheels. Other equivalent classifications are:
2-6-2+2-6-2 Under the Whyte notation for the classification of steam locomotives by wheel arrangement , a 4-6-2+2-6-4 is a Garratt or Union Garratt articulated locomotive using a pair of 4-6-2 engine units back to back, with the boiler and cab suspended between them.
The UIC classification is refined to (2'C)C2' for simple articulated locomotives. Challengers were most common in the Union Pacific Railroad, but many other railroads ordered them as well. An expansion for the Union Pacific Challenger class was the Union Pacific Big Boy class, being a 4-8-8-4, instead of a 4-6-6-4.
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The 4-6-4+4-6-4 was the fifth most common Garratt wheel arrangement, with 84 locomotives constructed, 74 by Garratt patent owner Beyer, Peacock & Company between 1936 and 1950 and ten under sub-contract from Beyer, Peacock by Belgian manufacturer Société Franco-Belge in 1952. [1] [2] Only three railway systems used this wheel arrangement.
4-6-4-4 wheel arrangement The PRR Q1 6130 - the only locamotive with this wheel arrangement In Whyte notation , a 4-6-4-4 is a railroad steam locomotive that has four leading wheels followed by six coupled driving wheels , a second set of four driving wheels and four trailing wheels .