Background. The article provides an overview of the current state of the railway container transportation market. Statistical data on the container transportation market is presented and analyzed. The article provides an overview of the work aimed at improving the organization of container transportation by rail. A generalized scheme of container delivery using rail transport is developed. The key objectives aimed at ensuring the reliability of container delivery are identified, and the main factors affecting the speed of container delivery are systematized. A mathematical expression of the delivery time of a container for the conditions of a direct option of transshipment from one mode of transport to another and taking into account the processing and storage of cargo at the terminal. Formulated the problem of optimizing the delivery scheme of containers in multimodal transportation in the conditions of the presence of several options of container terminals, their location. At the same time, according to the conditions of the formulated task, one processing of containers at the terminal is provided. A decision support system for changing the method of transportation of container products in multimodal transportation is proposed. Conclusions are drawn about the prospects of using the proposed system by transport and logistics companies. The purpose is to identify options for ensuring the flow and uninterrupted movement of container flows during multimodal transportation. Methodology. The article used an analysis of the current situation in the field of container transportation, mathematical modeling of container delivery time, optimization of the container delivery scheme based on the decision to overload the container at each terminal, and formulated a decision support system for delivery management. Results. The state of container transportation involving rail transport is determined, the analysis of studies in the field of container transportation using rail transport is performed, the directions of ensuring the reliability of container delivery are identified. A decision support system for multimodal container transportation is proposed. Practical implications. The results obtained can be used in the railway container transportation system, as well as by freight forwarding, operator, and transport and logistics companies.