Posted by Patrick McColgan on March 19, 2018 
I always thought this curve was derailment prone due to how tight it is. Was that the cause here?
Posted by Andre Menard on March 19, 2018 
Looks like a brand new tanker never had a chance to get dirty.
Posted by SES on March 19, 2018 
....and the tanker looks to be brand new or at least freshly painted.
Posted by David Deal on March 19, 2018 
Is this a "string line" accident?
Posted by Jorge on March 19, 2018 
What is a "string line" accident?
Posted by Jeff Swanson on March 19, 2018 
Looks like it. (If I can explain this right) it's caused when a train is pulled hard on the front and the heavier/loads trail lighter/less heavy cars in front of them. The curve is such that its' curvature causes the lighter to tip in the lightest area. If you have a model railroad, put a few empty flat cars behind a couple cars from the lead power. Then put 15-20 heavier ones behind the flats. Pull the train around a fairly tight curve and you'll see it happen there too.
Posted by OBrian Harmon on March 19, 2018 
I noticed the overturned cars couplers were still attatched. Is that typical of stringline derailments?
Posted by Nigel Curtis on March 19, 2018 
A string line accident happens if you have lightly loaded or empty cars in between loaded cars or at the head-end, with loaded cars behind. The weight of the loaded cars can pull the empties over on a curve, in other words, they take the line of least resistance, pull a piece of string that is curved and it will straighten, hence the name. If you have several empty cars, you should always marshall them at the end of the train.
Posted by David Meyer on March 19, 2018 
As a person who’s hometown has been Portland and a rail fan...sure looks like a string line incident to me. But hey, what do I know? Nothing. If you have ever stood at this curve, the flange noise can be unbearable. Very, very tight turn...
Posted by Pete Greischar on March 19, 2018 
Hello, GATX? Ummm, about your new tank car.....
Posted by Joshua Clark on March 19, 2018 
That curve looks unbelievably tight. It looks model railroad tight. I wouldn't doubt that trains stringline on this curve.
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