A series of MS-OTN transmission equipment that supports TDM, packet, and OTN services over a metro or campus optical network, providing cost-effective transport solutions for power, medical, Storage Area Networks (SANs), and data centers. Huawei has designed an all-optical network uniquely tailored to the needs of smart railways. It ensures security, reliability, and stability across railway services. Our single network can carry a multitude of services — such as PCM, SDH, OTN, and Ethernet — which centrally access the MS-OTN. These systems (ETCS, FRMCS, digital interlocking, sensor networks for localization etc. At the same time railway communication fiber optical networks become part of globally used. Nokia railway communications solutions help mainline and metro-urban operators use the power of Industry 4. 0 to achieve operational excellence, improve safety and security, enhance the passenger experience and reduce carbon emissions. Passengers have become so accustomed to reliable 24/7 connectivity in their everyday lives that they now expect that same experience. LTE-R (LTE for Railways): Specifically designed for rail networks, LTE-R enhances connectivity.