Horn block

the frame or pedestal in which a railway car axle box slides up and down; - also called horn plate.

See also: Horn

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Elgin's Martin Johnston was denied by a Robbie Horn block in the first half but should have done better with a snap shot before the break.
The machine planed the horn blocks for axle boxes to a previously unseen level of accuracy.
On the half hour Sefton goalkeeper Tim Horn blocked bravely and Reading hit the rebound against the bar.