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WASHINGTON — Several prototype Class 8 hybrid trucks are currently under development, but the technical and economic obstacles in the way of placing reliable and fuel-efficient heavy hybrid over-the-road trucks in service remain daunting, experts told a House subcommittee.

Roadrunner Transportation Services, formerly known as Roadrunner Dawes Freight Systems, said Monday it has rebranded to reflect new offerings its third-party transportation logistics, supply-chain management, and truckload and less-than-truckload services.

Cummins Inc. and Navistar International Corp. said Monday they have extended their engine supply agreement for Class 8 on-highway diesel engines through 2013.

Manufacturing growth in New York state declined in June, the Federal Reserve Bank of New York said Monday.

A portion of Interstate 80 remains closed in both directions in Iowa due to heavy flooding, and may remain closed into the middle of the week, the Des Moines Register reported Monday.

Caterpillar Inc., which lost its dominant position in heavy-duty engines last year because of persistent problems with 2007-compliant models, said it will pull out of the North American Class 8 market by 2010, except for a severe-duty truck and engine in partnership with Navistar International Corp.

Caterpillar Inc. and Navistar International Corp. said they will pursue business opportunities around the world together, as Caterpillar bowed out of the North American heavy-duty engine market last week.

BELSPRING, Va. — Inside Norfolk Southern Railway’s Cowan Tunnel at the foot of Virginia’s Blue Ridge Mountains, the latest intermodal ad-vancement is moving forward — 4 feet at a time.

The U.S. diesel average inched downward for the second consecutive week, dipping 1.5 cents to $4.692 a gallon, while gasoline topped the $4 mark for the first time ever, the Department of Energy reported.

Caterpillar Inc., which said Thursday it has signed an agreement to develop a heavy-duty truck with Navistar International Corp., said it would not develop and sell engines that meet 2010 emissions standards to other truck original equipment manufacturers.