**Acknowledgements**

The first author expresses gratitude to the Fundação para a Ciência e Tecnologia (FCT) for a PhD scholarship under the project iRail (PD/BD/143161/2019). The authors would like to acknowledge the support of the projects FCT LAETA–UIDB/ 50022/2020, UIDP/50022/2020, and UIDB/04077/2020.
