Noun
A bushing in the hub of a wheel, through which the axle passes.
The journal box of a rotating axle, especially a railway axle.
Source: Webster's dictionaryaxle-box
The axle box suspension usually consists of a spring between the bogie frame and axle bearings to permit up-and-down movement, and sliders to prevent lateral movement. Source: Internet
It was a heavy, cast-steel design weighing about convert, citation with sealed roller bearings on the axle ends, avoiding the need to maintain axle box oil levels. Source: Internet