Shunting operations at flat yards : retrieving freight railcars from storage tracks


Jaehn, Florian ; Otto, Alena ; Seifried, Kilian


[img]
Preview
PDF
jaehn et al 2016.pdf - Published

Download (721kB)

URL: https://madoc.bib.uni-mannheim.de/40968
URN: urn:nbn:de:bsz:180-madoc-409681
Document Type: Working paper
Year of publication: 2016
Place of publication: Mannheim
Publication language: English
Institution: Business School > ABWL u. Logistik (Fleischmann 2009-)
Subject: 330 Economics
Abstract: In this paper, we study the railcar retrieval problem (RRT) where specified numbers of certain types of railcars have to be withdrawn from the storage tracks of a flat yard. This task arises in the daily operations of workshop yards for railcar maintenance. The objective is to minimize the total cost of shunting via methods such as minimizing the usage of shunting engines. We describe the RRT formally, present a mixed-integer program formulation, and prove the general case to be NP-hard. For some special cases, exact algorithms with polynomial runtimes are proposed. We also analyze several intuitive heuristic solution approaches motivated by observed real-world planning routines. We evaluate their average performances in simulations with different scenarios and provide their worst-case performance guarantee. We show that although the analyzed heuristics result in much better solutions than the naive planning approach, they are still on average 30%-50% from the optimal objective value and may result in up to 14 times higher costs in the worst case. Therefore, we conclude that optimization should be implemented in practice in order to save valuable resources. Furthermore, we analyze the impacts of yard layout and the widespread organizational routine of presorting on the railcar retrieval cost.

Dieser Eintrag ist Teil der Universitätsbibliographie.

Das Dokument wird vom Publikationsserver der Universitätsbibliothek Mannheim bereitgestellt.




+ Citation Example and Export

Jaehn, Florian ; Otto, Alena ; Seifried, Kilian ORCID: 0000-0002-8547-2458 (2016) Shunting operations at flat yards : retrieving freight railcars from storage tracks. Open Access Mannheim [Working paper]
[img]
Preview


+ Search Authors in

BASE: Jaehn, Florian ; Otto, Alena ; Seifried, Kilian

Google Scholar: Jaehn, Florian ; Otto, Alena ; Seifried, Kilian

ORCID: Jaehn, Florian ; Otto, Alena ; Seifried, Kilian ORCID: 0000-0002-8547-2458

+ Download Statistics

Downloads per month over past year

View more statistics



You have found an error? Please let us know about your desired correction here: E-Mail


Actions (login required)

Show item Show item