RINA have determined a number of key areas of focus for rail industry suppliers to ensure that their safety arguments support their end customers CSM RA processes. These are: a clear and up to date Safety Plan, a clear description of the boundaries of supply (equipment and organisational), evidence of a thorough determination of possible hazards, a clear and complete Hazard Record, and clear arguments as to the applicability and use of Codes of Practice and Reference Systems. In this paper RINA presents effective methods to support supplier in achieving these goals.