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The Intermodal Association of North America said its constituents had adopted a voluntary program for inspecting intermodal equipment. The association’s president said she hoped the inspection program would head off legislation or government regulation.

U.S. retail sales of Class 8 trucks in May rose 28.8% from a year earlier, making total 2004 heavy-duty sales 44.5% higher than the first five months of 2003.

The Environmental Protection Agency released initial details of a pilot program that would measure diesel exhaust emissions during highway use with portable, onboard emission measurement systems.

WASHINGTON — Environmental Protection Agency officials said the agency would push for all 11 million diesel engines in the country to be retrofitted within 10 years in order to reduce their emissions of particulate matter.

The United States seeks to encourage trucking companies to reduce exhaust emissions as a way of improving air quality at the southern border and hopes to enlist the aid of Mexico in a coordinated effort, a U.S. Environmental Protection Agency official said.