Abstract The article notes the urgency of the problem of the formation and development of the regional multimodal transport network of Eastern Siberia and the Far East of Russia as a set of multimodal transport corridors. The enlarged functional structure of the design methodology for the integrated development of a multimodal transport network is presented. Using this methodology, the authors formulated the problem of designing the development of a regional multimodal transport network in Eastern Siberia and the Far East of Russia, gave a description of the proposed version of its appearance and the possible throughput of existing and new railways in the region under study. The options for the possible carrying capacity of the railway links of the network presented in the article represent an assessment of the potential of multimodal transport corridors, which is used to determine the options for the required traffic volumes along the network facilities.