Principles of the Feedback Action in Local Elements of Rail Yard Interaction

Achievement of high-quality servicing level of cargo owners should be carried out under unconditionally effective use of rolling stock of railways and technical means. The real transport process should be implemented based on logistic cargo supply chains by types of con-nections for each shipment. The practice of railway operation shows that there is a significant shortage of train locomotives as a result of which the departure of ready trains at rail yard is often not carried out. In such cases, a feedback effect in local elements of interaction of these stations occurs. Due to delay in departure of trains, sending of already formed trains from rail yards is delayed; furthermore, be-cause of the overflow of rail yard tracks, the sorting process on marshalling humps can be slowed down and delay of prepared trains for dismantling at arrival yard may occur. As a result of feedback action, downtimes of rail cars are increasing and movement of inventories is slowing down. In order to mitigate feedbacks effects in local elements of interaction, the principles of their operation, consideration of which will enable acceleration in passage of the rail car and cargo traffic through the railway network in practical activity, were formu-lated

Формалізація процесу управління парком вантажних вагонів операторських компаній

The technology of freight car fleet management of operators company in the subsystems of UZ has been investigated and analyzed. It has been determined that the choice of the optimal plan of distribution of car operators according to the route of a freight car (schedule lines) mainly depends on the volume of cars being present at freight stations of railway network and their location in space and time. The topology variants of railway network has been analyzed using theory of graph taking into account all the above said. Relying on a systematic approach it has been proved, that the increase of railway transport competitiveness is possible at the expense of the provision of railway subsystem with invariance properties. The railway subsystem itself should be considered as a compromise between its stability and flexibility.Thus, optimization model which formalizes technological process of freight car fleet management of operator companies has been mode.The objective of the given model is presented in the form of total operating cost and relevant set of constraints that takes into account technological conditions of route formation. The mode optimization model adequately reflects the terms of transportation process, ensures the reduction of transportation costs under the condition of satisfaction of clients’ requirements and provides for the formation of automated technology of management of car fleet of different forms of ownership. Taking into account the theory of computational complexity, it is reasonable to choose heuristic method, based on mathematical apparatus of genetic algorithms, to obtain the optimal plan of car distribution according to the routesСформировано математическую модель, которая формализует технологический процесс управления парком грузовых вагонов операторских компаний в виде оптимизационной задачи с целевой функцией, предоставленной в виде суммарных эксплуатационных расходов за период планирования и системой ограничений на технических и технологических условиях. Для решения задачи предложено использовать математический аппарат генетических алгоритмов.Сформовано математичну модель, яка формалізує технологічний процес управління парком вантажних вагонів операторських компаній  у вигляді оптимізаційної задачі з цільовою функцією, яку надано у вигляді сумарних експлуатаційних витрат за період планування і системою обмежень на технічних і технологічних умовах. Для рішення задачі запропоновано використовувати математичний апарат генетичних алгоритмів

Формалізація процесу управління парком вантажних вагонів операторських компаній

The technology of freight car fleet management of operators company in the subsystems of UZ has been investigated and analyzed. It has been determined that the choice of the optimal plan of distribution of car operators according to the route of a freight car (schedule lines) mainly depends on the volume of cars being present at freight stations of railway network and their location in space and time. The topology variants of railway network has been analyzed using theory of graph taking into account all the above said. Relying on a systematic approach it has been proved, that the increase of railway transport competitiveness is possible at the expense of the provision of railway subsystem with invariance properties. The railway subsystem itself should be considered as a compromise between its stability and flexibility.Thus, optimization model which formalizes technological process of freight car fleet management of operator companies has been mode.The objective of the given model is presented in the form of total operating cost and relevant set of constraints that takes into account technological conditions of route formation. The mode optimization model adequately reflects the terms of transportation process, ensures the reduction of transportation costs under the condition of satisfaction of clients’ requirements and provides for the formation of automated technology of management of car fleet of different forms of ownership. Taking into account the theory of computational complexity, it is reasonable to choose heuristic method, based on mathematical apparatus of genetic algorithms, to obtain the optimal plan of car distribution according to the routesСформировано математическую модель, которая формализует технологический процесс управления парком грузовых вагонов операторских компаний в виде оптимизационной задачи с целевой функцией, предоставленной в виде суммарных эксплуатационных расходов за период планирования и системой ограничений на технических и технологических условиях. Для решения задачи предложено использовать математический аппарат генетических алгоритмов.Сформовано математичну модель, яка формалізує технологічний процес управління парком вантажних вагонів операторських компаній  у вигляді оптимізаційної задачі з цільовою функцією, яку надано у вигляді сумарних експлуатаційних витрат за період планування і системою обмежень на технічних і технологічних умовах. Для рішення задачі запропоновано використовувати математичний апарат генетичних алгоритмів

Freight and passenger railway optimization

Das Ziel dieser Arbeit war es, einen Überblick über die aktuellen Beiträge der Literatur in den Bereichen der Eisenbahnlogistik sowohl im Güter- als auch im Personenverkehr zu geben. Während sich der Güterverkehr mit Problemen der Zusammenstellung der Züge und Waggons beziehungsweise der Verteilung der Leerfahrzeuge auseinander setzte, beschäftigte sich die Eisenbahnlogistik im Bereich des Personenverkehrs mit Optimierungsmodellen bezüglich Eisenbahnlinienplanung, Erstellung eines Fahrplanes, Inbetriebnahme von Fahrzeugen und Besatzungs- und Einsatzplanung. Die Bereiche der Eisenbahnlogistik haben in der Literatur eindeutig an Aufmerksamkeit gewonnen. In der Folge war es schwierig eine Auswahl aus dieser Vielfalt an Beiträgen zu treffen. Deshalb versucht diese Arbeit nur einen kurzen Einblick über einige wichtige Beiträge der letzten Jahre im Bereich der Eisenbahnlogistik zu geben. Aufgrund hochentwickelter mathematischer Techniken und deren Lösungsmöglichkeiten, die in den letzten Jahren aufgekommen sind, war es nun möglich die komplizierten Modelle der Eisenbahnlogistik in einer vernünftigen Zeit zu lösen. Darüber hinaus wurde ein Trend zur Entwicklung effizienterer entscheidungsunterstützender Hilfsprogramme für reale Gegebenheiten der Eisenbahnlogistik beobachtet. Im Großen und Ganzen sollten in Zukunft stärker integrierte Modelle der Eisenbahnplanung und Routenplanung entwickelt werden um robuste Lösungen und Methoden zu fördern.The aim of this work was to provide a survey of recent contributions about freight and passenger transportation. Whereas passenger optimization models considered problems such as line planning, train timetabling, platforming, rolling stock circulation, shunting and crew scheduling, freight transportation dealt with issues concerning car blocking, train makeup, routing, and empty car distribution. The field of rail transportation has clearly received attention resulting in a diversity of literature contribution. As it was difficult to handle the large amount of papers, this work is trying to give a short review of some important contributions made in recent years. Due to the increase in more sophisticated mathematical techniques, constant refinements in development of the models were made that were able to deal with larger problems. In addition, a trend towards more efficient transportation support systems was observed taking robustness into account. In addition, solution approaches that can deal with larger disturbances of the rail environment in a considerable speed and time, have received attention. Thus, future research can be done to develop more integrated models of scheduling and routing problems of train and passenger transportation to provide robust solutions and problem solving methods that handle disturbances of rail environment