DSW21 selects T-Systems to provide TETRA technology on LRVs April 14, 2016 | Europe Company News Dortmunder Stadtwerke AG (DSW21) has awarded a contract to Germany-based companies T-Systems to equip 157 light-rail vehicles (LRVs) with TETRA (Terrestrial Trunked Radio) radios and software to enabl... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password