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BS 4521-4:1975

Отменен
Specification for railway turnouts for private users, Heavy grade turnouts over which British Railways locomotives do not operate, for axle loads which may exceed 25 tons, using flat bottom rails — 50 стр.
ICS
45.080 Rails. Including track components / Рельсы и компоненты железных дорог. Включая компоненты рельсового пути