The work describes the conditions of functioning of integrated service and logistics formations, taking into account the performance of consolidating operations in transport hubs. A methodology for optimizing structural indicators in transport and service systems is proposed based on the condition of the creation of combined consignments of international cargo. There is a well-founded possibility of applying the principles of comprehensive evaluation of the results of service of foreign trade cargo flows to increase the competitiveness of the transport and logistics service. Using the basic principles of probability theory and mathematical statistics, the random nature of cargo flow service is modeled, and a methodology for substantiating the numerical values of the main indicators of the production activity of integrated formations is proposed under the condition of the random nature of the demand for transport and logistics services. According to the results of the calculations, the main indicators of service and logistics maintenance of foreign trade cargo flows in consolidating nodes were determined under the condition of the stochastic nature of transport and technological processes. The interpretation of the performed calculations provides grounds to propose a set of measures to improve the infrastructure support of integrated production formations. And the structural optimization of transport and service systems of international direction allows ensuring a competitive level of reliability of transport and logistics service of foreign trade cargo flows.