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plural axleboxes
A bushing in the hub of a wheel, through which the axle passes. examples
The journal box of a rotating axle, especially a railway axle. quotations examples
The bogies, which have been specially designed to enable the vehicles to travel at express speeds have single bolster suspension and roller bearing axleboxes.
1961 October, “Car carriage by rail - at home and abroad: 1. New B.R. "covered wagons"”, in Trains Illustrated, page 594