Disclaimers: Estimates use system averages; level of precision results in limitations for formal reporting. Actual emissions and savings may vary based on routing and other factors. Union Pacific's fuel consumption rate is applied to other carriers' miles for interline moves. One-way shipments only; does not include backhaul or empty positioning. Greenhouse Gas equivalents are estimates based on Environmental Protection Agency calculations.
Assumptions: Weight of locomotives is 8% of Gross Tons. Emission Factors from The Climate Registry General Reporting Protocol, May 2008 CO2e, or Carbon Dioxide Equivalent, includes Carbon Dioxide (CO2), Methane (CH4), and Nitrous Oxide (N2O). Truck fuel efficiency based on EPA/NHTSA, Draft Regulatory Impact Analysis: Proposed Rulemaking to Establish Greenhouse Gas Emissions Standards and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles.