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and stations, the cost of transportation, the duration and number of “windows”, the availability of traction rolling stock and crews, wagons, formation plan, etc. – and perform calculations both for the network as a whole and for any of its polygons with flexibly changing boundary conditions and optimization criteria.

      Currently, the model calculates the optimal passage of car traffic at the specified values of transportation volumes, throughput and processing capacities and unit cost. The skipping of all correspondence specified by the plan is simulated, with the minimum cost of their transportation over the network. In the event of situations when car traffic exceeding its capacity is sent to the site, the model offers such options for bypassing bottlenecks that provide the minimum possible cumulative additional costs.

      The analytical subsystem built into the model generates a wide range of reports, such as: bottlenecks; the cost of transportation; correspondence that the model recommends to skip in circles; correspondence that had to take several different routes. An independent evaluation of the effectiveness of the solution obtained using the model for the direction of car traffic, conducted by specialists of JSC NIIAS, showed that the total estimated savings in operating costs could amount to about 3 billion rubles per year under the current norms and schedule.

      The model can be applied to solve a wide range of planning tasks, both long – term – capital investments, and short-term – for technological aspects of operational work. Examples of such tasks can be an assessment of the General Scheme, checking the feasibility of transportation plans under given infrastructure constraints, and tariff modeling.

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