Ethernet, Cybersecurity, TCMS, EN 50657, IEC 50128, WTB, MVB, IEC 61131, IEC 61375, fault handling, SWrS, operational monitoring, HVAC systems, train control system engineering, system specifications, passenger comfort, climate control logic development, functional descriptions, TRDP, energy optimization, Diagnostics, RArS, operational functionalities, communication interfaces, interface documents, RAMS testing, alarm management