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House Transportation Committee Chairman James Oberstar (D-Minn.) said he was “deeply troubled” over a claim by truck safety inspectors that proposed legislation requiring the purging of flammable materials from tanker wetlines would be “difficult, if not impossible,” to enforce.

The Senate Commerce, Science and Transportation Committee advanced the nominations of several other key administration officials to the full Senate on July 21, including the nomination of Deborah Hersman to lead the National Transportation Safety Board.

Trucking groups hailed the decision by the National Conference on Weights and Measures not to proceed with proposals to regulate the temperature of retail fuel at the pump.

U.S. retail diesel prices dropped 4.6 cents last week to $2.496 a gallon, the Department of Energy reported — the fourth straight decline — but rising crude oil costs will soon lead to a reversal of that trend, a department analyst predicted.

Vitran Corp. said Thursday its second-quarter income fell to $400,000, or 3 cents a share, compared with $4.6 million, or 34 cents, a year ago.

Burlington Northern Santa Fe Corp. said its second-quarter profit improved but its revenue fell on lower overall freight demand.

Canadian transportation firm TransForce Inc. said its second-quarter net income fell to C$18 million, or 21 cents a share, from C$19.3 million, or 22 cents, a year ago.

Truckload carrier Knight Transportation’s second-quarter profit was about even with a year ago at $12.6 million, or 15 cents a share, compared with last year’s $12.7 million, or 15 cents.