The journal box of a rotating axle, especially a railway axle. [
1913 Webster]
" In railway construction, the axle guard, or pedestal, with the superincumbent weight, rests on the top of the box (usually with a spring intervening), and holds it in place by flanges. The box rests upon the journal bearing and key, which intervene between the inner top of the box and the axle."
[1913 Webster]