Belgrade, Serbia, 2. February 2012.- BusPlus is the payment method for the GSP Belgrade, Tram and Train system. It is a thin, plastic card on which the customer electronically loads fares. Passengers are now able to credit personalized and non personalized tickets on various shops and since February 1st, they entirely replaced the existing paper card and stamps. According to Authority, the whole process is going to improve public transportation overall.