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In this rulemaking, PHMSA is seeking comment on revisions to the Hazardous Materials Regulations (HMR) applicable to the transportation of oil by rail. Currently, the majority of the rail community transporting oil, including crude oil transported as a hazardous material, is subject to the basic oil spill response plan requirement of 49 CFR 130.31(a) based on the understanding that most rail tank cars being used to transport crude oil have a capacity greater than 3,500 gallons. However, a comprehensive response plan for the shipment of oil is only required when the oil is in a quantity greater than 42,000 gallons per package. Tank cars of this size are not used to transport oil by rail. As a result, the railroads do not file a comprehensive oil response plan. Based on this difference and the recent occurrence of high-profile accidents involving crude oil, the National Transportation Safety Board (NTSB) has recommended in Safety Recommendation R-14-5 that the Department and PHMSA reconsider the threshold quantity for requiring the development of a comprehensive response plan for the shipment of oil. In response to the NTSB Safety Recommendation R-14-5 and significant interest from congressional stakeholders, environmental groups, and the general public, PHMSA is seeking specific comment on revisions to the oil spill response plan requirements in 49 CFR part 130, including threshold quantities.