Authorities in the US state of Utah are investigating why railroad crossing arms weren't down and lights and bells were off when a double-decker passenger train violently smashed into the back of a semi-trailer.br The two people in the cab of the trailer and the 82 passengers aboard the train weren't seriously injured.br br COURTESY "NORTH SALT LAKE POLICE DEPARTMENT"br br RT LIVE br Subscribe to RT! br Like us on Facebook Follow us on Twitter Follow us on Instagram Follow us on Google+ Listen to us on Soundcloud: br RT (Russia Today) is a global news network broadcasting from Moscow and Washington studios. RT is the first news channel to break the 1 billion YouTube views benchmark.