Contactless RFID-cards for large metro systems and other traffic systems offer numerous benefits compared to conventional contact-based tickets. As the ticket validation is carried out without direct contact to a reader, public transportation organizations are able to realize cost-savings through reduced maintenance efforts for mechanically heavily stressed equipment in conventional, contact-based mass transportation systems. Furthermore, the ticket validation process is much quicker than manual stamping thus reducing waiting queues and offering a convenient entry process for passengers. Access control and time entry (tickets and cards) are central applications . Public transportation involves both, and RFID technology is increasingly used in this area. RFID-based public transportation applications help significantly increase efficiency with several millions of passengers per day that need to be equipped with reliable and convenient access solutions. The adoption of contactless entry systems in public transportation is growing not only for high-quality access cards. Public carriers increasingly seek to improve their systems with comprehensive solutions that cover the entire range of tickets used.