Modele decyzyjne w planowaniu cyrkulacji lokomotywy w kolejowym transporcie towarowym
Decision models in locomotive routing problem in rail fright

Summary/Abstract: With the promotion of the environmentally friendly transportation modes, (the European Commission supports the freight transport operations in the rail sector) the increase of demand’s diversification is observed. While most rail freight companies tend to apply fixed schedules, meeting the customer’s specific requirements causes that this approach is not effective. The scope of this paper is to present a case study of rail freight planning over a medium term horizon and to discuss the opportunities of these plans improvement by discrete optimization. The problem of routing freight traffic is modeled as a dial-a-ride problem with two additional groups of constraints. In the proposed approach the optional transportation requests are considered. Such requests correspond to empty cars movements and are not specified before a solution procedure is lunched. Additionally the need of periodic inspections of locomotives are took into consideration. Based on our experience this issue plays a very important role in the tactical planning process. Despite a thorough review of the literature the presented extensions have not been considered in this area yet.

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