HTM begins testing Avenio trams for Haag, Germany June 24, 2015 | Europe News Den Haag transport operator Haagsche Tramweg Maatschapp (HTM) has begun daylight testing of the 60 Avenio trams received from Germany-based Siemens. Initially, the trams will be deployed on Line 2 and... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password