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Under the Whyte notation for the classification of steam locomotives, a 2-6-4 locomotive has two leading wheels, six coupled driving wheels and four trailing wheels.
17 Ιουν 2006 · The 2-6-6-4’s four-wheel trailing truck was needed to support a large, deep firebox that was placed behind the rear driving wheels. This big firebox was critical to producing the high combustion rates required for a modern high-horsepower steam locomotive.
The 2-6-6-4 was a fairly late development, a product of the superpower steam concept, introduced by the Lima Locomotive Works, which encouraged the use of large fireboxes supported by four-wheel trailing trucks. Such a firebox could sustain a rate of steam generation to meet any demands of the locomotive's cylinders, even at high speed.
Locomotives classified 2-6-4 under the Whyte notation of locomotive axle arrangements. The equivalent UIC classification of locomotive axle arrangements is 1C2 or 1'C2'.
7 Οκτ 2018 · LMS Stanier 3-Cylindered 2-6-4 Tank steam locomotives – Sole Survivor. Compact but fast, the 3-Cylindered 2-6-4 Tanks are some of the first engines designed by William Stanier for the London, Midland & Scottish Railway (LMS).
In the Whyte notation for the classification of steam locomotive wheel arrangement, a 2-6-6-4 is a locomotive with a two-wheel leading truck, two sets of six driving wheels, and a four-wheel trailing truck.
A decade and half after the Reading introduced the 2-6-4T Q1-a and Q1-b locomotives to commuter service ( Locobase 2808 ), it rebuilt eight of the boilers in 1920-1922 with almost four dozen fewer tubes.
