If I can clarify, there was a reduction of speed to 50 for all key trains with 20 or more cars of dangerous goods. That was issued last year. That also required the risk assessments to be done, and that where there were higher-risk areas, they would need to look at, for crude oil, etc., a speed of 40 miles an hour. But it wasn't a consistent requirement in all urban areas. There were about 28 risk factors that were looked at.
On April 23rd, 2015. See this statement in context.