North America is now one of the biggest producers of crude oil in the world, partly because of fracking in North Dakota and other Western states. With a lack of pipelines in place to move the oil, much of it has been pushed onto the rails. Much of that oil is moved in tank cars found to spill their loads when accidents occur. With the increased traffic, accidents have piled up across North America. Refineries processing much of the crude from the Bakken formation in the West are in the Philadelphia area. In May, the federal government told the railroads to give that information to states where they shipped large quantities of crude. Many states made the information public, but Pennsylvania was one of the states that opted out, citing that the information was “confidential” and “proprietary” to railroads. The state emergency response agency denied our public records requests (as well as other news agencies requests) for the information. PublicSource wanted to show people where trains were traveling in Pittsburgh and the potential affected population living around those lines.