Data from an engine on the train that crashed in Washington yesterday (December 18) has shown it was travelling at 80 mph along a curve which had a limit of just 30 mph.
The train derailed and crashed into a motorway during rush hour, killing three people and putting 72 in hospital, according to the BBC.
Ten of those being treated in hospital are said to be in a serious condition and authorities believe the death toll could increase.
Two lorries and five other vehicles were hit when train 501 derailed, however despite several road users being injured no one was killed.
The train that derailed was an Amtrak train and it was the first journey to be taken on a brand-new route, designed to be quicker for passengers. Previously the area had only been used by freight trains.
Train 501 was travelling to Portland from Seattle, and had left Seattle at 6am local time (2pm GMT).
At the time of the crash there were 77 passengers on board as well as seven Amtrak crew members and a train technician.
The National Transportation Safety Board (NTSB) believes investigators are likely to be on the scene for roughly a week to 10 days as they establish full details about the incident.