I did read that the CN/North America's Railroad is reporting NO SERVICE DISRUPTIONS and it looks like Amtrak uses the same tracks. I don't understand, can anyone explain?
It is easier to continue running freight trains in marginal conditions since a stranded freight train is not going to have hundreds of people needing food and creature comforts, and the freight will not scream blue murder for the inconvenience caused by being stranded, and write their Congressmen and talk to newspaper and TV reporters.
So when one is not reasonably certain that the journey will be completed, it is better to call it off.