The objective of this Standard is to describe the requirements to be applied by all rail organisations to ensure that safety risks associated with changes to railway train control systems (TCS) assets or systems are identified and eliminated or reduced so far as is reasonably practicable (SFAIRP).This Standard provides the Australasian rail industry with a set of mandatory and recommended requirements for the management of change in TCS. It provides a framework for managing change that is consistent with AS 7717 and AS 7718. This Standard is intended to be used by rail infrastructure managers, rail operators and suppliers of railway systems.The scope of this Standard includes:(a) managing multiple changes on the one set of train control system infrastructure;(b) Safeworking system selection;(c) operational and technical requirements for changes and documenting operational performance of train control systems;(d) testing requirements for different levels of changes;