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Service network design for freight railway transportation / G. Lulli in Journal of the operational research society (JORS), Vol. 62 N° 12 (Décembre 2011) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 62 N° 12 (Décembre 2011) . - pp. 2107–2119 Titre : Service network design for freight railway transportation : the Italian case Type de document : texte imprimé Auteurs : G. Lulli, Auteur ; U. Pietropaoli, Auteur ; N. Ricciardi, Auteur Année de publication : 2011 Article en page(s) : pp. 2107–2119 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Rail  transportation  Service  network  design  Practice  of  OR  Tabu  search Index. décimale : 001.424 Résumé : In this paper, we present a case study on freight railway transportation in Italy, which is a by-product of research collaboration with a major Italian railway company. We highlight the main features of the Italian reality and propose a customized mathematical model to design the service network, that is, the set of origin-destination connections. More specifically, the model suggests the services to provide, the number of trains travelling on each connection, the number of cars and their type. We consider both full and empty freight car movements and take handling costs into account. All decisions are taken in order to minimize the total costs. The quality of service is guaranteed by satisfying all the transportation demand and by implicitly minimizing the waiting time of cars at intermediate railway stations. Our approach yields to a multi-commodity network design problem with a concave cost function. To solve this problem, we implement a specialized tabu search procedure. Computational results on realistic instances show a significant improvement over current practice. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n12/abs/jors2010190a.html [article] Service network design for freight railway transportation : the Italian case [texte imprimé] / G. Lulli, Auteur ; U. Pietropaoli, Auteur ; N. Ricciardi, Auteur . - 2011 . - pp. 2107–2119. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 62 N° 12 (Décembre 2011) . - pp. 2107–2119 Mots-clés : Rail  transportation  Service  network  design  Practice  of  OR  Tabu  search Index. décimale : 001.424 Résumé : In this paper, we present a case study on freight railway transportation in Italy, which is a by-product of research collaboration with a major Italian railway company. We highlight the main features of the Italian reality and propose a customized mathematical model to design the service network, that is, the set of origin-destination connections. More specifically, the model suggests the services to provide, the number of trains travelling on each connection, the number of cars and their type. We consider both full and empty freight car movements and take handling costs into account. All decisions are taken in order to minimize the total costs. The quality of service is guaranteed by satisfying all the transportation demand and by implicitly minimizing the waiting time of cars at intermediate railway stations. Our approach yields to a multi-commodity network design problem with a concave cost function. To solve this problem, we implement a specialized tabu search procedure. Computational results on realistic instances show a significant improvement over current practice. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n12/abs/jors2010190a.html