Modeling of large railway polygons

Abstract

When large junctions of railway polygons are studied, detailed modeling is subject to some limitations. Therefore, it is necessary to develop appropriate tools. This paper presents an aggregate (macromodeling) technique for necks and yards of railway stations. Results of calculations based on aggregate models are highly consistent with results of detailed modeling, which confirms the applicability of this modeling method to railway polygons. The proposed principles were implemented on the basis of the IMETRA simulation system. The resulting polygon model makes it possible to determine the total throughput of a polygon and to identify bottlenecks that slow down car traffic.

Influence of transport and logistics infrastructure of industrial enterprises on the efficiency of marshalling yards

“…The initial basis elements are marked with αi and the finite elements with γi. All other phases βi are intermediate [3]. The basis elements include the engagement of technological lines at the goods yard for delivery to the freight zone (receiving-and-departure yard, the breaking-up system, marshalling yard, station bottlenecks), the finite ones are the station elements to departure trains to the railway network (freight-handling equipment for loading-and-unloading zones, the make-up system, marshalling yard, receiving-and-departure yard), and intermediate ones are the elements of demurrage and waiting for operations at the basis and finite elements.…”

“…The studies of Russian scientists [2] highlight the great influence of freight traffic unevenness on the transportation process. Its non-deterministic nature was identified through the application of probability theory and methods of mathematical statistics by studying the nature of train make-up and building a deterministic-stochastic series [3]. Variations can also be caused by seasonal trends in goods production and consumption and have rather stable patterns.…”