Among the freight transportation modes, the railroads are considered to be a more environmentally friendly option for shippers or customers seeking to transport higher volumes of goods while emitting fewer carbon emissions.
Indeed, freight railroads account for 0.5% of total U.S. greenhouse gas emissions and just 1.9% of transportation-related GHG emissions, according to the Association of American Railroads (AAR), quoting a statistic from the Environmental Protection Agency.
AAR also estimates...
https://www.freightwaves.com/news/how-carbon-calculators-can-help-rail-customers