Robertson Tunnel
The Robertson Tunnel is a twin-bore light rail tunnel through the Tualatin Mountains west of Portland , Oregon , United States , used by the MAX Blue and Red Lines . 
<triplet> Robertson Tunnel <subj> Tualatin Mountains <obj> mountain range <triplet> MAX <subj> light rail <obj> instance of <subj> Blue <obj> has part <subj> Red Lines <obj> has part <triplet> Blue <subj> light rail <obj> instance of <subj> MAX <obj> part of <triplet> Red Lines <subj> Portland, Oregon <obj> located in the administrative territorial entity <subj> MAX <obj> part of