They will also look at what could have affected the engineer's ability to operate the train, like medical problems, personal issues or distractions.
It's unclear why the train was traveling at a high speed in a 30-mph zone.
Anderson said the company's safety culture can continue to improve and said the crash should be seen as a "wake-up call".
"They said we were still on the tracks due to mechanical difficulties, I think it was", Shafer told OPB.
But despite the overwhelming evidence it could save lives, Congress extended the deadlines for railroads to implement positive train control.
Union Pacific, the nation's largest freight carrier, said it was spending about $2.9 billion on the technology. The agency says it could've prevented 150 crashes since 1970.
A video from Monday's fatal accident showed the locomotive tilting and the crew bracing for impact as it headed at 80 miles per hour into a 30 miles per hour curve in track near DuPont, Wash., according to investigators from the National Transportation Safety Board (NTSB).
Apple slows down older iPhones, faces lawsuit
Recent revelations show that there is a feature on iPhone that slows it down eventually. Al Jazeera's Charlotte Bellis reports.
A Metro-North train crashed in New York City in 2013, killing four people, when an engineer with sleep apnea dozed off. The bypass was upgraded to allow passenger trains to gain time by getting off of BNSF tracks that are heavily used by freight trains.
It is activated on the tracks Amtrak owns along the Northeast Corridor, from Boston to Washington, D.C., and on Amtrak's MI line. He said the NTSB will work to recreate the last moments of the Washington train's movement and will consider everything from mechanical issues, to something on the track, to speeding. Sensors have been installed, but the system needs to be synchronized, tested and certified before it goes online, Sound Transit spokeswoman Rachelle Cunningham said.
The National Transportation Safety Board's investigation could take up to a year or longer before a final report is issued.
Speed control technology which could have prevented a fatal train derailment near the USA city of Seattle was not active at the time of the crash, authorities have said.
A 2008 Metrolink crash in California that killed 25 people pushed PTC to become a hot-button issue on Capitol Hill.
Amtrak 501 was supposed to leave Seattle's King Station at 6 a.m. Monday, Dec. 18, but some passengers reported hearing that the train was delayed due to mechanical issues. "It's using the best technologies available to complement what the human engineer is doing - the human element of it".
- Muore schiantandosi con l'auto contro un muretto
- Apple sued in Chicago for slowing down older iPhones
- Largest US Bitcoin exchange halts trading as cryptocurrencies plummet
- Woman suspected of stealing Red Kettle
- Auston Matthews returns to practice with Leafs
- Got the OnePlus 5T? OnePlus 6 already rumoured with in-display fingerprint sensor
- James Franco HIGHlariously Spoofs Hallmark Channel Christmas Movies In Unaired SNL Clip
- Ed Sheeran Christmas number one for 2017
- Hockey Canada announces 2018 Olympic women's hockey team
- Man planned Christmas terror attack for SF's Pier 39