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However, congestions or disruptions may significantly decrease these systems\u2019 efficiencies, making predicting and understanding the resulting train delays a priority for railway organisations. Delays are studied in a wide variety of models, which usually simulate trains as discrete agents carrying delays. In contrast, in this paper, we define a novel model for studying delays, where they spread across the railway network via a diffusion-like process. This type of modelling has various advantages such as quick computation and ease of applying various statistical tools like spectral methods, but it also comes with limitations related to the directional and discrete nature of delays and the trains carrying them. We apply the model to the Belgian railways and study its performance in simulating the delay propagation in severely disrupted railway situations. In particular, we discuss the role of spatial aggregation by proposing to cluster the Belgian railway system into sets of stations and adapt the model accordingly. We find that such aggregation significantly increases the model\u2019s performance. For some particular situations, non-trivial optimal levels of spatial resolution are found on which the model performs best. Our results show the potential of this type of delay modelling to understand large-scale properties of railway systems.<\/jats:p>","DOI":"10.1140\/epjds\/s13688-022-00359-1","type":"journal-article","created":{"date-parts":[[2022,7,30]],"date-time":"2022-07-30T09:02:51Z","timestamp":1659171771000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Modelling railway delay propagation as diffusion-like spreading"],"prefix":"10.1140","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3543-6889","authenticated-orcid":false,"given":"Mark M.","family":"Dekker","sequence":"first","affiliation":[]},{"given":"Alexey N.","family":"Medvedev","sequence":"additional","affiliation":[]},{"given":"Jan","family":"Rombouts","sequence":"additional","affiliation":[]},{"given":"Grzegorz","family":"Siudem","sequence":"additional","affiliation":[]},{"given":"Liubov","family":"Tupikina","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2022,7,30]]},"reference":[{"issue":"3\u20134","key":"359_CR1","doi-asserted-by":"publisher","first-page":"220","DOI":"10.1016\/j.jrtpm.2018.09.001","volume":"8","author":"S Zieger","year":"2018","unstructured":"Zieger S, Weik N, Nie\u00dfen N (2018) The influence of buffer time distributions in delay propagation modelling of railway networks. 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