The objective of this Standard is to provide a consistent approach to the use of axle counters within the Australian and New Zealand railway industry. This Standard provides requirements and recommendations for the design, installation, maintenance, and operation of axle counters systems in safety critical applications. The scope of this Standard includes the following: (a) Design. (b) Network and operational requirements. (c) Track maintenance considerations. (d) Testing and maintenance requirements. Where the safety requirements of an axle counter system do not require a SIL 4 rating this Standard may be adopted in part or in full if appropriate to do so.