Definition of the noun 4-2-0
What does 4-2-0 mean as a name of something?
- Under the Whyte notation system, a steam locomotive that has a four-wheel leading truck followed by a single driving axle.
4-2-0: Under the Whyte notation for the classification of steam locomotives, 4-2-0 represents the wheel arrangement of four leading wheels on two axles, two powered and coupled driving wheels on one axle, and no trailing wheels. This type of locomotive, often called a Jervis type, was common on American railroads from the 1830s through the 1850s.