Temeljni cilj ovoga rada jest istražiti i analizirati uzroke nastanka izvanrednih događaja u željezničkom prometu. Svrha rada jest prepoznati glavne uzročnike nastanka izvanrednih događaja kako bi moguće korektivne akcije rezultirale maksimalnim povećanjem sigurnosti željezničkog prometa. Rezultati istraživanja temelje se na sekundarnim podacima o uzrocima nastanka izvanrednih događaja na prugama HŽ Infrastrukture za razdoblje od 2014. do 2019. godine. U radu su korištene znanstvene metode analize i sinteze, metode deskriptivne statistike te Pareto grafikon. Glavni nalaz ovoga rada upućuje na zaključak da su nesmotreno ili zlonamjerno djelovanje drugih osoba i tehnički nedostatak na infrastrukturnim podsustavima ili vozilima upravitelja infrastrukture odgovorni za 83,7 % izvanrednih događaja na prugama HŽ Infrastrukture, dakle više od svih drugih uzročnika zajedno. The main goal of this work is to investigate and analyze the causes of extraordinary events in railway traffic. The purpose of the work is to identify the main causes of the occurrence of extraordinary events so that possible corrective actions result in a maximum increase in the safety of railway traffic. The results of the research are based on secondary data on the causes of extraordinary events on the tracks of Croatian Railway Infrastructure for the period from 2014 to 2019. Scientific methods of analysis and synthesis, methods of descriptive statistics and the Pareto chart were used in the work. The main finding of this paper points to the conclusion that reckless or malicious actions of other persons and technical defects in infrastructure subsystems or vehicles of the infrastructure manager are responsible for 83.7% of extraordinary events on the tracks of Croatian Railway Infrastructure, i.e. more than all other causes combined.