Today, new challenges are emerging for the railway industry: the digitalization of the infrastructure and the automation of supervision, maintenance, and even trains. These new requirements and the growing number of applications demand comprehensive connectivity with high reliability, high availability, low latency, and, in some situations, high throughput. Furthermore, the existing private telecom network dedicated to railway is built on 2G technologies and has to be replaced by 2035. The European FRMCS program relies on the standardization of “5G plus MCx” for railway applications, shifting from a network as an asset vision to a more modern one: the Network as a Service. However, despite the transition from 2G to 5G for the existing infrastructure, a significant portion of the railway network will still lack coverage from the private telecom network. Given this context, the emergence of new high-performance applications prompts us to explore new telecom solutions, ranging from sharing a public terrestrial network to using satellite communication networks and incorporating millimeter-wave technology. One potential solution could be orchestrating these technologies to provide the train with the best available connection at any point during its journey.