1-5-8 
The results presented show that it is possible within 15 s with a 
99 999% probability to select the track upon which the train is 
travelling from parallel tracks separated by 3.5 m. 
8 CONCLUSION 
This paper has presented the results of a test aimed at identifying 
the effectiveness of an integrated DGPS, dead reckoning and map 
matching system. From the inference of the statistics, the location 
of a train can be isolated to a particular track from multiple 
parallel tracks, separated by 3.5 m at a 99.999% probability after 
travelling 15 s. Further analysis is being undertaken into larger 
sections of track and areas of adverse conditions. 
9 ACKNOWLEDGEMENTS 
The author wishes to acknowledge the assistance of John Kean of 
the Department of Natural Resources, Brisbane for providing 
details of the permanent survey marks used in the test; Jim Steed 
for providing the AFN data; Bob Ross and Peter Oates of Land 
Victoria for providing the GPS receivers; Peter Vincent of 
OmniSTAR Pty. Ltd. for providing the differential correction 
service and equipment; and Queensland Rail for providing access 
to their locomotives, track and signalling sheds. Thanks also to 
Tony Dsouza and Stuart Ross of Westinghouse Brake and Signal 
Company (Australia) Ltd. for their assistance in performing these 
surveys. 
Finally, I would like to thank Marc Chadwick and Wayne 
McDonald of Westinghouse Brake and Signal Company 
(Australia) Ltd. for organising and funding the surveys. 
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