Tragic Derailment - VIA Rail

[TinGoat]

That locomotive is probably more fuel efficent and mechanically sounder than the RDC's it replaced, and though it only had 75 passengers on this trip I'm sure it is fuller on others. It doesn't cost much more in fuel to pull 5 cars than it does 2 so provide some comfort and leg room for the customers.
It's tragic that this accident happened and 3 crewmen were killed. Has a caused been determined?
My heart goes out to the families of the crew and to the other passengers who were injured.
Charlie

RDC's are generations behind the type of DMU's that are running in most civilized countries around the world today.