Cause of deadly Amtrak derailment under investigation

An Amtrak train derailed in Montana, resulting in fatalities and injuries. The derailment occurred near a track switch, and experts suggest mechanical failure rather than human error as the cause. Investigations are ongoing to determine the exact reason for the incident.

What time did the Amtrak train derail in Montana?

Who did the Associated Press speak to regarding the derailment?

What did David Clark suggest might have caused the derailment?

What was the general direction of the investigation according to the expert from The New York Times?

What does the expert suggest is likely the reason for the incident not being human error?