Abstract
The paper presents a traffic information system called KRJ that covers Polish railways and airlines transportation systems. Basic algorithmic foundations for the system are given. The system was previously designed as a standalone program. Recently, it has been moved to Internet and made available at a commercial Web site as a service called Ekspres. The process of migration into Internet service and problems encountered are described. The paper concludes with experiences gained so far from a one-year exploitation under operational workload.
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