The procedures of public procurement contracts as well as framework contracts have been regulated by the law in order to procure goods, works or services. By the new Public Procurement Act a healthier economic environment has been enabled with rules addressed erga omnes, with benefits for public contracting authorities, economic operators but the European union citizens as well. The changes address the effectivness of the public procurement procedure and its transparency. This work presents the course of procuring a framework contract in the company HŽ Infrastruktura LLC. For the public procurement in HŽ Infrastruktura LLC to become more transparent and accessible to its partners, an Internet web portal has been set up with up to date dana on all public procurement procedure sin process. The new system, along with the transparency, aims at accomplishing operational cost savings, value for money but also at introducing new suppliers into the system. Following the introduction that gives insight into goals, principles, importance of public procurement for the economy of Croatia, procurement value and concluded procurement contracts, the second chapter presents the public procurement procedures. From then onwards, the work presents the open procedure cycle of public procurement. The fifth chapter presents the technique and instruments of collective and electornic public procurement, electronic bidding and catalogues. The sixth chapter presents in detail the notion of framework contract, its types, deadlines of concluding them as well as the selection criteria of most favourable bid. The last chapter presents a case study of framework contract concluded with an economic operator for four years and relates the service of auxiliary train rent.