Currently about 1800 companies-operators of railway rolling stock operate on the market of railway transport services in Russia, which, depending on the gradation using different methodological approaches to the management of fleet of private cars. The article offers a concept of rational management of rolling stock general for all operators of cars, which is a set of basic principles of target management and system adaptation to environmental conditions, the joint application of which will improve the quality of operation and quality of the operator’s production. For further improvement of operator’s management system it is necessary to move from the base rational management model to a more efficient model for the optimal control by economic criteria. It is proved that the operational planning of freight traffic by the criterion of minimizing empty mileage of cars and regulation by the criterion of cost minimization of car-hours allows operating personnel of car operators to minimize operating costs from freight transportation. For implementation of the concept of rational management of car fleet the appropriate information technology developed on the basis of formalization of management process on ARIS system methodology is offered. According to the process approach productive activity of the operator of cars can be presented in the form of model of operating cycle containing the following business processes: application campaign; management of car fleet structure; transportation management; commercial work; calculations and efficiency analysis. Implementation of information technology of operational management by freight transportation will allow raising profit and profitability of the operator of cars due to improvement of quality of corrective actions of the dispatching personnel of the operator.