Noun.  Under the Whyte notation system, a Mallet-type locomotive with no leading truck, two sets of six driving wheels, and no trailing truck.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.