TCMS handle vital control and management of multiple subsystems inside the train/consist and serve as the interface to the train driver, staff, and wayside services. In recent years, the need for a fast and reliable Ethernet network capable of handling a high bandwidth in public transit has increased significantly. As TCMS are crucial for operating the vehicles in traffic, it becomes vital to ensure that they always work and have communication with all other systems inside the train. The critical operational and safety-related services inside TCMS place high demands on the data communications network. Also, the difficult operational conditions on-board trains create a unique set of requirements and challenges. Westermo has developed robust data communications products specifically for solving common challenges for applications, such as inter-consist communication, communication with cloud services, and redundant communications paths within the TCMS in public transit.