We first flagged issues with those cars about 20 years ago. They started to come up in our investigations. We made a couple of very specific points on them. As time went on we learned more and more. I would say that this accident gave us the opportunity to learn the very most, because the whole train was class 111 tank cars. We were able to study each and every tank car to see how it performed and how it failed in the accident. That's why we came out with a very firm recommendation on January 23.
On April 1st, 2014. See this statement in context.