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Please note: This summary is provided to help you understand the regulations. Consult the references provided for links to the full text of the regulations.

Transportation Modes » Rail » Engine Emissions, Clean Diesel Requirements

Best Speed for Fuel Economy Summary Full Text
Engine Emissions (Locomotive) Summary Full Text
Engine Emissions (Locomotive, Idling) Summary Full Text
Freight Density - Impact and Cost Summary Full Text
Greenhouse Gas Comparisons Summary Full Text
LNG Tank Venting Summary Full Text
Best Speed for Fuel Economy
Applies to: Any vehicle
Requires: Potential for improved fuel economy can be estimated for any vehicle based on engine power and drag forces
See also:
Engine Emissions (Locomotive)
Applies to: All diesel line-haul, passenger, and switch locomotives that operate within the U.S. including newly manufactured locomotives and remanufactured locomotives (this generally happens every five to 15 years, depending on the locomotive) that were originally manufactured after 1972
Requires: EPA has established emission standards for oxides of nitrogen (NOx), hydrocarbons (HC), carbon monoxide (CO), particulate matter (PM) and smoke for newly manufactured and remanufactured locomotives.
See also:
  • Clean Air Act
  • Engine Emissions (Locomotive, Idling)
  • National Clean Diesel Campaign (exit TERC)
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    Engine Emissions (Locomotive, Idling)
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    Applies to: All diesel line-haul, passenger, and switch locomotives that operate within the U.S. including newly manufactured locomotives and remanufactured locomotives (this generally happens every five to 15 years, depending on the locomotive) that were originally manufactured after 1972
    Requires: The regulations focus on requiring manufacturers to include automatic idle reduction technologies on newly manufactured or remanufactured locomotives, rather than directly regulating when railroads may allow locomotives to idle.
    See also:
  • Clean Air Act
  • Engine Emissions (Locomotive)
  • National Clean Diesel Campaign (exit TERC)
    • Freight Density - Impact and Cost
    Applies to: Allocating carbon dioxide emissions and fuel costs of transportation based on density
    Requires:

    Not currently a regulatory requirement. This allocation method is mathematically required for consistent impact calculation and reporting.
    See also:
  • Freight density, carbon footprint, and fuel cost (PDF)
  • TERC Bulk Buster - Cost and emissions calculator for cargo, by density (spreadsheet)
    • Greenhouse Gas Comparisons
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    Applies to: Any vehicle
    Requires: Calculators based on emission factors provide a useful but limited way to compare the greenhouse gas emissions of transportation modes
    See also:
  • Best Speed for Fuel Economy
  • Greenhouse Gas Emissions
    		•
    LNG Tank Venting
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    Applies to: All liquefied natural gas (LNG) fuel tanks
    Requires: Both fuel level and internal tank temperature must be known to calculate how long an LNG tank can avoid venting fuel to the atmosphere.
    See also:
  • Alternative Fuels
  • Greenhouse Gas Emissions
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