HŽ Infrastruktura manages railway lines longer than 2,604 km in the Republic of Croatia. It maintains 542 stations and stops, 1,512 level crossings, 109 tunnels and 548 bridges. HŽ Infrastruktura is responsible for traffic management and operation, for rehabilitation, maintenance and construction of railway infrastructure.
Within the scope of Croatian railway network modernization, HŽ Infrastruktura emphasizes projects, for which co-financing has been foreseen largely from EU funds, i.e. those projects for which HŽ Infrastruktura has already secured European funding, as well as all other projects that can be realized by co-financing from EU funds.

HŽ Infrastruktura has 2 international loans: a WB loan for the Sustainable Croatian Railways in Europe Project, to improve the operational efficiency and the financial sustainability of the public railway sector in Croatia, and an EBRD loan, for the HZ Infrastructure Modernisation Project for restructuring, modernisation and capital investments.