Amtrak train crash outside Tacoma shuts down I-5

They have a system called "positive train control" which is supposed to give automatic control over a train not doing what it should.

https://www.theatlantic.com/politics/archive/2017/12/washington-wreck-positive-train-control/548744/

A throttle governor and Dead Man Switch are a Positive Train Control .

A central computer is not.

It was operator error or serious mechanical malfunction that had a train at 81 mph... long before the corner that should have been taken at 30.
 
A throttle governor and Dead Man Switch are a Positive Train Control .

A central computer is not.

It was operator error or serious mechanical malfunction that had a train at 81 mph... long before the corner that should have been taken at 30.

Close enough for government work.
 
To my great surprise,,, I-5 is reopened.

Bad spot and bad time to be closed. They brought their A-Team.
Good Work Road crew !
 
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