Increased population density and private vehicle usage have led to traffic problems in the metropolitan city of Istanbul. At this point, Istanbul Metropolitan Municipality is trying to improve the urban transportation with the presented projects. The aim of this paper is to encourage public transportation. For this particular purpose, projects are being offered in this field. For example, rail system investment is one of the important projects, including many transportation projects. Since the rail system investments require large amount of budget, it is not practical among all planned projects. Therefore, the projects should be selected by prioritizing. In this study, the project evaluation criteria were determined, and in this respect, the rail system projects were prioritized by using the fuzzy analytical network process (ANP) which is one of the multi-criteria decision- making methods and offers good solutions in difficult decision-making processes.