More infomation can be found on the website of HŽ Infrastruktura.
Also, information is available daily from 5:00 AM to 11:00 PM by calling call 060 333 444 (call cost: EUR 0.23/min from a landline and EUR 0.39/min from a mobile network; HT d.d.), call01 4724 026, or via mail informacije@hzpp.hr