The effect of broaching on the toughness and fatigue resistance of the ****rial surrounding bolt-holes on B.S.I. rail steel (IM-FM-004)

The practice of broaching rails was introduced on B.R. following laboratory tests which demonstrated that this process usefully increased the fatigue limit of rai1 steel sections (Refs. 1, 2). However, rail end failures involving broached bolt-holes were soon observed (Refs. 3, 4 ), a disquieting feature of which was the...