stop, but he's required by regulations to sound his bell. i may have said horn. he's required to sound his bell as he goes through past a station stop and he did that. he recalled doing that. but he has no recollection of anything past that. >> reporter: the ntsb is not ready to draw any conclusions based on what they found so far. they will reassemble the train to inspect it. amtrak says they hope to have limited service by monday full service by tuesday. >> adam, so the area in which the accept take oig train and acela express train were allegedly hit by something, is that the same area pretty much where the derailed train with such the tragic consequences is it the same area in which that happened? >> reporter: it appears to be the same area. it appears to be some what have a pattern. two windows were hit and on the acela, it appears a passenger