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Frank Heibel PhD MSc (Hon) CPEng MIEAust FIRSE

Doc Frank Pty Ltd

The signalling systems of the metropolitan rail networks in the major Australian cities face their most prominent technology upgrade for decades, the introduction of modern Automatic Train Control (ATC). Key drivers for this introduction are:

• Increase signalling safety by introducing train protection or replacing existing train protection solutions that have become obsolete and insufficiently reliable;
• Increase the capacity of railway lines without major infrastructure investment, e.g. for building additional tracks or lengthening station platforms to run longer trains;
• Reduce cost for operation and maintenance of signalling field equipment by replacing it with in-cab signalling technology; and
• Enhance efficiency of train operations by substituting the “human error element” with increased levels of automation.
• For selecting the most suitable technology, railway operators have a fundamental choice between an overlaid ATC system over the existing signalling infrastructure with fixed block signalling, such as the European Train Control System (ETCS), or an independent solution introducing virtual or moving block signalling, such as Communications Based Train Control (CBTC).

This paper outlines some considerations for selection between those two types of ATC systems. Two topics specifically addressed are the implementation risk of those technologies and the much discussed subject of interoperability from a practical application viewpoint. The analysis uses case studies from current ATC introductions in Australia and aims to draw commonalities for providing some strategic guidance to the arguably most influential signalling technology decision for at least 20 years.