The letter summarizes the freight railroads' commitment to reducing greenhouse gas emissions in response to the President's call for businesses to cut emissions intensity by 18% over the next decade. It notes that railroads are already three times more fuel efficient than trucks. The railroads plan to achieve a projected goal of a 15% reduction in emissions intensity by 2012 through innovative fuel efficiency initiatives, improved operating practices, and cooperation with the Department of Energy on research. The letter requests the Department of Energy's continued support for public-private efforts to improve railroad fuel efficiency.