axle guard

Century Dictionary and Cyclopedia

1. n. Those parts of a railroad-car in which the axle-box plays vertically under the yield and reaction of the car-springs.

Wiktionary

1. n. 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.

GNU Webster's 1913

1. 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.