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 built in 1932, for pulling trains through hilly terrain.
These locomotives had a set of internal rods between the driving wheels, which has made some people like André Chapelon Consider them to be 2-10-2s.
| Single engine types |
|
|---|---|
| Divided drive and Duplex engine types | |
| Articulated locomotives Fairlie, Meyer and Garratt types | |
| Articulated locomotives Mallet types | |
| Articulated locomotives Triplex and other Multiplex types | |
| Articulated locomotives Engerth types | |
| Geared locomotives | |