Portal Bridge
Owned and operated by Amtrak as part of the Northeast Corridor , and used by NJ Transit , it is considered the busiest train span in the Western Hemisphere , carrying between 150 , 000 and 200 , 000 passengers per day on approximately 450 daily trains ( an average of one train every six minutes over a 24-hour period ) . 
<triplet> Amtrak <subj> Northeast Corridor <obj> owner of <triplet> Northeast Corridor <subj> Amtrak <obj> owned by