DB AutoZug
Night trains were operated with the sister company CityNightLine AG ( headquartered in Zurich , Switzerland ) ; until CityNightLine AG merged with DB NachtZug . 
<triplet> CityNightLine AG <subj> Zurich <obj> headquarters location <subj> DB NachtZug <obj> followed by <triplet> DB NachtZug <subj> CityNightLine AG <obj> follows