in the Federal State of Baden-Württemberg, Germany. Furthermore, this system is coupled with the implementation of low-cost sensors in the railway track in order to provide a dense network directly on the railway infrastructure.
We strongly believe that the covered topics provide a range of interesting themes related to early warning systems and further our knowledge in this field. Indeed, there are many other aspects of early warning systems which deserve detailed attention. The provided manuscripts do, however, provide a sample of some of the work being carried out in the respective fields. The guest editors want to thank the authors for their submissions and their patience during the process of managing this special issue. We also want to acknowledge the hard work of numerous reviewers, who improved the quality of the manuscripts significantly. Finally, we deeply appreciate the guidance and support of the NHAZ editorial team, who helped us tremendously to finalize this special issue.