Media type: E-Article Title: Methodology for profitability assessment in the case of old rolling stock replacement with new trains in Bulgarian State Railways Contributor: Stoilov, Valeri; Velkov, Kiril; Krastev, Oleg; Slavchev, Svetoslav imprint: EDP Sciences, 2017 Published in: MATEC Web of Conferences Language: Not determined DOI: 10.1051/matecconf/201713303005 ISSN: 2261-236X Origination: Footnote: Access State: Open Access