In the dramatic clip, the truck is seen crossing the tracks in the middle of a snowstorm before the train suddenly appears and smashes into the heavy goods vehicle. Officials say the trailer of the truck was almost cut in half by the train as the driver of the Fed Ex lorry as it crossed the track.
The railway crossing gate arms were up not down at the time of the crash. And the Utah Transit Authority (UTA) say the flashing lights and bells were not activated.
They say the gates were affected by weather conditions. A UTA spokesman said: In the event of a power outage or lack of signal, crossing gates are programmed to default to the 'down and active' position as a safety precaution.
"Preliminary information indicates the gates were affected by the severe ice and snow conditions at the time and were in the default 'down and active' position, as they are programmed.
"After an employee responded to the location, the gates moved to the up position. The agency has never had an accident like this before, and UTA is investigating why and how it happened to ensure it doesn’t occur again.
A Fed Ex spokesman told Fox 13 News : "We are aware of the incident in Salt Lake City and are grateful that no one was seriously injured. "We worked with authorities during their investigation to quickly clean up the scene and minimise the impact on customers."