Wiener Linien to launch 10 hydrogen buses on Line 39A, Vienna December 1, 2025 | Europe News, News Wiener Linien has deployed 10 CaetanoBus H2.City Gold hydrogen buses into service on Line 39A in the Döbling district, marking Vienna’s first fully hydrogen-operated bus route. The vehicles were suppl... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password