Class I / Republic Locomotives / Cummins Engine Company Inc. / Union Pacific / MK Rail Corporation / Detroit Diesel Corporation / Norfolk Southern / Conrail / Caterpillar Inc. / General Motors / MotivePower Industries / General Electric Transportation Systems / Graphical HC and CO / Emission Reduction Technologies / CSX / /
American Short Line Railroad Association / Locomotive Emission Standards Regulatory Support Document Locomotive Emission Standards Regulatory Support Document Office / Surface Transportation Board / Contents Chapter / Mobile Sources office of Air / Department of Transportation / U.S. Environmental Protection Agency EPA / Federal government's Surface Transportation Board / American Public Transportation Association / Association of American Railroads / /