(Portland, OR) -- Amtrak Cascades is set to resume service along the Point Defiance bypass next week, nearly four years after a train derailed on its way from Seattle to Portland, killing three people. Amtrak says service will resume next Thursday morning, with a total of eight trains scheduled to use the bypass daily. Amtrak released a statement saying it has added multiple safety measures and has implemented a majority of the National Transportation Safety Board's recommendations, with plans to implement the rest of the recommendations later. The National Transportation Safety Board ruled early last year that inadequate planning, insufficient crew training, excessive speed and human error were to blame for the deadly December 2017 derailment. Three people were killed and dozens were injured in the crash.