May 15 (SeeNews) - Croatian state-owned rail infrastructure operator HZ Infrastruktura said on Friday it signed a 17.9 million kuna ($2.6 million/2.4 million euro) contract with a local consortium comprising ZPD, Granova, Institut IGH, Rijekaprojekt and IPZ to prepare the design study for the modernisation of the Ostarije-Skrljevo railway section.