ZF to provide infra monitoring for Graz Tramway, Austria November 1, 2018 | Europe News Graz Linien, the public transport operator in Graz, has selected ZF Friedrichshafen AG (ZF) to provide condition monitoring system and intelligent type plate for two tramlines in 2019. The contract wa... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password