Sponsored by the scientific societies SFdS, SMAI and SMF, the prix de thèse maths-entreprises (maths-industry PhD prize) rewards each year researches in mathematics with a strong industrial impact. In 2023, it was awarded to Guillaume Dalle, a former CERMICS PhD student. His PhD thesis, supervised by Yohann De Castro and Axel Parmentier, was carried out in partnership with the French railway company SNCF. It combined machine learning and operations research to make railway planning more resilient to hazards. Guillaume Dalle currently holds a postdoctoral position at the École Polytechnique Fédérale de Lausanne (Switzerland), and he plans to continue his academic career at the interface between applied mathematics and ecological transition.