5G-VICTORI: Future Railway Communications Requirements Driving 5G Deployments in Railways. - Ioanna Mesogiti; Eleni Theodoropoulou; Fotini Setaki; George L. Lyberopoulos; Anna Tzanakaki; Markos P. Anastasopoulos; Christina Tanya Politi; Panagiotis Papaioannou; Christos Tranoris; Spyros G. Denazis; Paris Flegkas; Nikos Makris; et al. (AIAI (Workshops), 2021)