Critically important infrastructure objects play an important role in the national security system by transporting loads, which provide the possibility of developing and working for many national economy sectors. It is very well known that zero risks do not exist, so it is necessary to clearly recognise the hazards and to assess the situation in time in order to plan and, if necessary, minimise potential harmful effects on the environment, economy, etc. The aim of the research is to study the impact of one of the hazards options on the population and identify potential consequences by using situation modelling. When operating rolling stock, there exists a possibility of major accidents that can lead to pollution of the atmosphere, land, water bodies, and damage to human health and may result in fatal outcomes, as well as serious material damage to the environment. The object of the research is located in Jelgava area, on the left bank of the Lielupe, in the territory of Jelgava transport infrastructure, Stacijas street 1A, Jelgava. The analysis of cargo flow shows that the most dangerous substances at the object are liquefied gas, petrol, ammonia. These substances, except ammonia, may serve as the starting stage of a possible accident and create a domino effect with other dangerous cargo situated in the territory of the object, for example, ammonium nitrate. In case of damage to a separate tank the hazard of possible accident at the object increases significantly due to the use of great number of tanks, as well as the possibility of domino effect increases because the tanks are close to each other. The worst variant of an accident is possible for inhabitants in case of south wind when the downtown with plenty of public institutions is affected. Passenger station is also adjacent to the territory of the object; that is why the most dangerous place of origin of the accident at the object directly opposite the station building was selected for the modeling. The results of the research: risks and potential consequences that may arise in one of the options for potential hazards are examined.