Siemens Mobility to implement CBTC system on Hamburg Metro Line U2 and U4, Germany November 11, 2022 | Company News, Europe Company News, Europe News, News Siemens Mobility has secured a contract from the Hamburger Hochbahn to install Trainguard MT install communications-based control (CBTC) system on Hamburg Metro Lines U2 and U4. The Grade of Automat... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password