corrugations of rails

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Tramway track — is used on tramways or light rail operations. Grooved rails (or girder rails) are often used in order to make street running feasible. Like standard rail tracks, tram tracks consist of two parallel steel rails.Tram rails can be placed in several… … Wikipedia
Charles Osmond Frederick — is a British engineer who worked on interaction of rails and wheels at the British Railway Technical Centre, Derby. Together with P.J. Armstrong he developed the Armstrong Frederick plasticity models, which are applied in the theory of inelastic… … Wikipedia

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