Train Management and Control System

The Train Management and Control System (TMACS) is a Communications-based train control system used on over 5,000 kilometres (3,100 mi) of track in Australia.

Unlike most train protection systems, TMACS does not use balises or any other trackside equipment. Instead, it uses GPS to identify the locomotive's position. TMACS is only used in Train Order territory, where there are no trackside signals, only points indicators and main line indicators.

The CBTC-based system using virtual-block movement authority limits, which are called electronic authorities. The electronic authority replaces a paper-based system of train orders, which operated similarly to Track Warrant Control, and continues to be used on some branch lines in Australia.

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