B. TRAINS.
DoT ’19 [United States Department of Transportation; 2019; “Rail Climate Considerations,” https://railroads.dot.gov/rail-network-development/environment/rail-climate-considerations]
The transportation sector emits the highest amount of greenhouse gas (GHG) emissions of all the U.S. sectors, with the rail sector contributing 2% of those emissions. Rail plays an important role in reducing the transportation sector's emissions due to the efficiency of passenger and freight rail transportation. FRA is committed to reducing rail’s carbon footprint through supporting the expansion of electrification and other sustainable fuels, expanding the rail network to provide a more efficient choice for passengers and goods shipments, and reducing GHG emissions from the operations, maintenance and construction of the rail system.