Transport services are crucial for economic development and quality of people's life. One of the major problems of modern traffic is congestion of road and air traffic, causing negative impacts on the environment and the quality of life. For this reason, it is necessary that transport policy guide the development of transport, which will reach sustainable mobility with different measures. Increasing the volume of rail traffic have an important role to achieve this objective. Slovenian transport policy is coordinated with transport policy of the European Union, because its transport network is part of the TEN-T network. TEN-T policy has set itself the objectives which should be reached in 2030 and 2050. One of the objectives is also to divert 30% of freight traffic from road to rail by 2030 at distances greater than 300 km. This is made possible primarily through the establishment of a rail network that is competitively well-developed road transport. Slovenia in recent years initiated greater investment in the railways, which will improve the state of the railway infrastructure and increase the use of this form of transport. In this thesis, I examined the extent to which rail lines meet the requirements of the TEN-T core network and assess whether they will meet those requirements by 2030 when the planned
measures will be implemented. With a simple account, I also considered whether the measures envisaged in relation to the anticipated traffic will be sufficient to assume 30 % of road freight transport by 2030. The realization of planned and necessary measures also depends on the ability of financing, so I also compare systems of financing in the field of railways in Slovenia and other countries.