2-4-4T

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Under the Whyte notation for the classification of steam locomotives by wheel arrangement, 2-4-4 is a steam locomotive with two unpowered leading wheels followed by four powered driving wheels and four unpowered trailing wheels. This configuration was only used for tank locomotives; no tender locomotives with this wheel arrangement were made.

Equivalent classifications

Other equivalent classifications are:

• Italian classification
  )
• French classification
  : 122
• Turkish classification
  : 25
• Swiss classification
  : 2/5

The equivalent

is 1′B2′ t (or (1′B)2′ t for a Mason Bogie).

Examples

This unusual wheel arrangement does not appear to have been used on the

. Developmentally, there are two logical ways of reaching this wheel formula: to add a forward axle to a Forney locomotive to improve its ability to negotiate curves, or to add a second trailing axle to a Columbia design, notably in a 2-4-4(T) configuration to expand its coal capacity.

Four 2-4-4T passenger locomotives were built by the Czechoslovak Škoda for Lithuania in 1932 and marked as Tk class. They were seized by the USSR in 1940, then by the Germans.^[1] One was used after World War II in Poland as the OKf100-1 until 1950.^[2]

Other tank locomotives with 2-4-4T arrangement:

• Bavarian D XII
• French T5 6601 - 6637 of AL railway

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