Fatigue tests on rails with work hardened bolt holes. The optimum degree of work hardening (E-345)

During the fabrication of switches and crossings for the Derby, London Road Junction, layout at Messrs. Taylor Bros. works in 1959, the opportunity was taken to work harden all the bolt holes in the layout, which was made in 95 lb./yds. B,H. rail. When this work was complete it was...