Axle guard \Ax"le guard`\ The part of the framing of a railway car or truck, by which an axle box is held laterally, and in which it may move vertically; -- also called a jaw in the United States, and a housing in England. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

Axle guard \Ax"le guard`\ The part of the framing of a railway car or truck, by which an axle box is held laterally, and in which it may move vertically; -- also called a jaw in the United States, and a housing in England.

Source: Webster's Revised Unabridged Dictionary (1913)