Meant - to establish material requirements for cast austenitic manganese steel for fixed crossings and cradles for - crossings with moveable parts designed to be welded or bolted to rails; - to formulate codes of practice for inspection, testing of un-machined and machined heat-treated castings; - to list the methods by which crossings should be identified and traced; - to define limits of weld rectification by the supplier; - special requirements for pre-hardened crossings.