6. Communications Systems Onboard Trains

This chapter explores the critical yet often overlooked topic of onboard train communication networks, which are essential for the efficient operation and management of modern trains. It begins by defining key terms and types of trains, setting the stage for a detailed examination of the Train Communication Network (TCN). The chapter delves into the specific challenges posed by the railway environment, such as vibrations and electromagnetic compatibility (EMC), and how these factors influence the design and implementation of onboard hardware. One of the central themes is the distinction between the Train Control and Management System (TCMS) and Onboard Multimedia and Telematic Services (OMTS), each requiring tailored solutions to meet their unique demands. The chapter provides a comprehensive overview of various TCN technologies, including RS-485, CAN, MVB, and ECN, each with its own strengths and applications. It also discusses the evolution of train backbone networks, highlighting the role of standards like IEC 61375 in shaping the future of train communication. Additionally, the chapter touches on the importance of sensor networks and non-standard technologies, offering a glimpse into the innovative solutions being developed to enhance train safety and performance. For those interested in the technical intricacies of train communication, this chapter offers a wealth of information on the latest standards, protocols, and best practices, making it an indispensable resource for anyone involved in the design, implementation, or maintenance of onboard train networks.