Vázquez Méndez, Miguel ErnestoCasal Urcera, GerardoCastro Ponte, AlberteSantamarina Ríos, Duarte2023-05-262023-05-262023Computers & Operations Research 154 (2023) 106217http://hdl.handle.net/10347/30610This paper deals with the problem of designing a bypass on a railway line. Based on a geometrical model capable of determining automatically the need of major structures (bridges, tunnels, overpasses and underpasses), the optimal design of a railway bypass is formulated in the framework of Mixed Integer Non Linear Programming (MINLP), and it is solved with a numerical algorithm which provides different layout alternatives that are optimal solutions (local minima) from the economic point of view. The proposed method is tested on a case study with the aim of showing its practical usefulness as a support tool for engineers in order to accomplish the complex and time-consuming task to generate a set of initial alternatives for the design of a railway bypasseng© 2023 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)http://creativecommons.org/licenses/by/4.0/Railway bypassMixed integer non linear programmingRailway alignment optimizationObtaining local minimajournal article10.1016/j.cor.2023.1062170305-0548open access