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Rocking back and forth and tuns of noise and then we came to a stop and really it was -- we didn't know what was going on. >> reporter: amtrak now has an incident response team on the ground to help out with this ntsb investigation, which is just getting started. a lot of factors here. speed will be one of the big factors that investigators will look at, whether or not this train was under a speed restriction on this section of track. the entire empire builder line, the entire trip, takes about 45 hours from chicago to seattle. the average speed about 50 miles an hour. the train can go up to 8...

And she detailed that weather is another issue that investigators will be looking for. from those images it didn't appear that there was severe weather in the area. do we know anything about what it was like when the train derailed? >> a beautiful day, about 80 degrees out. typically these issues with derailments because of heat happen on really, really hot days. that doesn't seem to be an issue here and you can see in the images, it's a beautiful, big sky montana day there. it doesn't seem like weather will be a factor here. although investigators never leave any stone unturned as they look a...

The train is going to slow down coming into the station. one of the things i was noting was whether you go slower when you're in a city right? if you're on a part of track that's running through a crowded residential neighborhood than if you're sort of out in the middle of nowhere and on a big straightaway. >> yeah it can change based on some of those factors. a lot of it has to do with track geometry, whether there's a curve, whether the curve is super elevated whether or not there's crossings in the area there's a lot of different factors that go into how fast the train should be going. a lo...

>> so take me through the basics of how safety works in terms of speed. the train is going to slow down coming into the station. one of the things i was noting was whether you go slower when you're in a city, right? if you're on a part of track that's running through a crowded residential neighborhood than if you're sort of out in the middle of nowhere and on a big straightaway. >> yeah, it can change based on some of those factors. a lot of it has to do with track geometry, whether or not there's a curve, whether the curve is super elevated, whether or not there's crossings in the area, there...