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Analyzing the Use of Various Types of Locomotives for Heavy-duty Main-line Railroads of Mongolia Based on Traffic Simulation

The requirements for ensuring freight traffic speed, reliability, safety, and economic efficiency pose a number of complex logistical problems to be solved by the Ulan-Bator Railway System, such as the choice of optimal train mass, the type of locomotive and the number of its sections for driving the freight train with the specified weight. The following fleet of main-line locomotives is currently in use in the country: 31 2TE116UM locomotives produced in the Russian Federation, 2ZAGAL locomotives produced in Mongolia, one EVOLUTION, and two DASH001 locomotives produced in the United States. A full mathematical model of the traffic speed control system including freight train models is considered. For modeling the traction transmission, an integrated model of the system is developed in the Simulink/Matlab application. With the chosen modeling method, the initial data for each version under study are varied, including the locomotive traction force and the train and locomotive masses. In modeling, the entire Tolgoyt-Choir route was divided into four sections, each of which had its own slope and own maximum speed. The simulation results (for different combinations of traction locomotives) and the obtained characteristics, including the curves of vehicle speed, driving time, and fuel consumption are presented.