42 U.S.C. § 13332: Coal-fired diesel engines

The Secretary shall conduct a program of research, development, demonstration, and commercial application for utilizing coal-derived liquid or gaseous fuels, including ultra-clean coal-water slurries, in diesel engines. The program shall address—(1) required engine retrofit technology; (2) coal-fuel production technology; (3) emission control requirements; (4) the testing of low-Btu highly reactive fuels; (5) fuel delivery and storage systems requirements; and (6) other infrastructure required to support commercial deployment.