1. Track and Civil Engineer, Public Transport Div., Dept. of Transport, Melbourne, Victoria 3001, Australia.
2. Senior Lecturer, Dept. of Civil Engineering, Building 60, Monash Univ., Victoria 3800, Australia (corresponding author).
3. Associate Professor, Dept. of Civil Engineering, Building 60, Monash Univ., Victoria 3800, Australia.
4. Manager, Pressure Injection, Downer Edi Works, Adelaide, Australia.
5. Senior Engineering Adviser, Infrastructure, RailCorp, New South Wales, Australia.