The Kuna 1.5bn ($US 225m) project involves track-doubling, resignalling, and upgrading of track for 22.5 tonne axleloads as well as construction of six new bridges, reconstruction of seven existing bridges, upgrading traction substations, and the elimination of 17 level crossings. Construction will begin early next year and the project will be completed by September 2019, enabling passenger trains to operate at up to 140km/h.

HŽ Infrastruktura says it received six bids for the contract, which will be signed before the end of the year.

The line is part of the European Union's Mediterranean Core Network Corridor, ERTMS corridor D and Rail Freight Corridor 6.

Under an agreement concluded with the Ministry of Maritme Affairs, Transport and Infrastructure in June, the European Regional Development Fund will finance 85% of the project cost with the remainder coming from the Croatian treasury.