GPS based train positioning is opening more and more new means for rail transport improvement. Based on GPS, the train positioning system OPTIVIA developed by Bombardier Transportation combines multi-sensor data and provides an integrated positioning solution which can be used in many rail applications without a cost intensive infrastructure. This paper at first presents the principle systems architecture of the OPTIVIA System. This system consists of a scalable hardware and modular software. Thus it can easily be adapted to customer needs. The system is delivered yet to industrial railways, rail transport operators and main railways. For its ATLAS -Advanced Train Location and Administration System project SNCB/NMBS has awarded a contract to Bombardier Transportation to deliver the OPTIVIA System. The idea of ATLAS is presented in this paper. To improve the fleet and locomotive management at the control center, the OPTIVIA Mobile train positioning platforms are installed on about 450 locomotives and report their positions periodically via public radio communication (GSM-SMS) to the OPTIVIA Center at Brussels. This application enables SNCB/NMBS to combine and calculate all data which are depending on the locomotive position from their existing data bases. The paper will also describe various railway operational functions as far as they are part of the ATLAS project.
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