German Regulator approves Vossloh’s Citylink tram-trains for Karlsruhe suburban network July 8, 2015 | Europe News The German Federal Railway Authority has certified Germany-based Vossloh’s Citylink tram-trains to operate on the suburban network operated by Verkehrsbetriebe Karlsruhe GmbH (VBK). VBK has exer... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password