As railroad tracks become major conduits for oil, petroleum products, and—not as widely noticed—materials like industrial sand, pipe, and chemicals for the hydraulic fracturing of oil and natural gas wells, some states are grappling with changed train routes, speeds and traffic patterns that spell new hazards for pedestrians and motorists. Daily Climate. 16 March 2015.
http://www.dailyclimate.org/tdc-newsroom/2015/03/Train-deaths-rise-amid-energy-driven-rail