Siemens Mobility to install ATC system across Vienna U-Bahn Line U6, Austria August 19, 2021 | Europe Company News Siemens Mobility has secured a contract from Wiener Linien, the public transport provider in Vienna, to install the automatic train control (ATC) system ‘Trainguard MT Zub’ on all trains o... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password