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This rulemaking, developed in consultation with the Federal Railroad Administration, would revise PHMSA's regulations to expand the applicability of comprehensive oil spill response plans (OSRPs) based on thresholds of liquid petroleum oil that apply to an entire train. We are also proposing to revise the format and clarify requirements of a comprehensive OSRP and to require railroads to share information about high-hazard flammable train operations with state and tribal emergency response organizations (i.e., State Emergency Response Commissions and Tribal Emergency Response Commissions) to improve community preparedness. Lastly, PHMSA is proposing an update to boiling point testing procedures to provide regulatory flexibility and promotes enhanced safety in transport through accurate packing group assignment.