In a first-of-a-kind cooperative effort, Ford Motor Co. and the U.S. Environmental Protection Agency are developing a hydraulic hybrid automotive power train. "It's a little unusual," says Ford advanced-engineering spokesperson John Harmon. "The EPA actually holds the patent for the technology." Harmon said that it is too soon to determine how efficient the power train is. However, he did say it is somewhat like electric hybrid power trains, but instead of batteries it uses hydraulic reservoirs for storing power. Eaton Corp. is providing power train product development expertise. For more information, go to www.eaton.com, www.ford.com, or www.epa.gov.