Maintenance of transport infrastructure and vehicles is important cost element of the budget of local transport companies, cost reduction is optimized by adapting appropriate strategies. Obsolescence can directly and indirectly influence the operation and maintenance of public transport systems. Challenged by the technical wear and lack of spare parts, it is impossible to cover increased needs with amenities to the given level. The reliability and availability of transport systems will be adapted at minimal cost and maximum safety criteria. Case study: the tram system in Oradea.