Tier 4, ‘All Notches, All the Time’
Written by William C. Vantuono, Editor-in-ChiefFullerton, Calif.-based technology company Rail Propulsion Systems LLC (RPS), partnering with the North Carolina DOT, the North Carolina State Clean Tech Center and the Federal Highway Administration, has demonstrated what it’s describing as “the first diesel passenger locomotive in the United States with combined in-use emissions lower than the current EPA Tier 4 standard.”
