Rub iron

an iron guard on a wagon body, against which a wheel rubs when cramped too much.

See also: Rub

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive
Wear plates were riveted to the sides where the bolster stakes rubbed, and heavy concave rub irons protected the bottom corner of the box from damage by the front wheels when turning.
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