Now some thoughts.
At first glance it does appear to be a tight radius curve. What is missing is the necessary information to determine what it 'really' looks like. If there is any amount of telephoto lens applied to this photo that would produce a foreshortening affect that would skew the visual rendering of the photo making things appear 'squashed together' or in this example produce the appearance of a much tighter curve than is reality.
Keep in mind that information indicates that this section of track is rated for 79 mph. Note also there is no indication of rail malfunction - the rail seems to be intact and if speed or track failure were involved one would think we would see some rolled rail right here. You will of course run into a segment of normally intelligent people who will scream about the preliminary information that the train was going 81. Maybe it was, maybe not. Was this information from the recorder, from the speedometer, is there a variance between actual and indicated speed, and just how much realistic difference do you believe 2 mph will make? The Amtrak wreck in Philly was on a 50 mph curve that the engineer took at 110. THAT would make a big difference.
I am not there and the news photos do not give enough information to determine much more than the train derailed to the outside of the curve because presstitutes, much like web commenters know little or nothing about trains. Considering that we may never get the full story and useless uninformed surmizations are counter productive I will offer my comments here. Because I can.. ;-)
With all the above said, I am leaning toward the camp of those who claim sabotage. But I'll wait for the report rather than die on that hill. Now if some allah snackbar or tree hugging antifa types come forward and claim responsibility..