A 2-4-6-2 steam locomotive, in the Whyte notation for describing locomotive wheel arrangements, has a two-wheel leading truck, one set of four driving wheels, one set of six driving wheels, and a two-wheel trailing truck.

Other equivalent classifications are:
UIC classification: 1BC1 (also known as German classification and Italian classification)
French classification: 1231

This most unusual wheel arrangement was only ever used on a duplex locomotive type.

Ten 2-4-6-2 (151A) compound locomotives were built in 1932 for the Paris-Lyons-Marseilles Railway (P.L.M.) to haul heavy freight trains on the 0.8% grade between Les Laumes and Dijon. After electrification of the line, the 151A were sent for service in northeastern France. They were withdrawn from service in 1956 and scrapped.

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