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Union Pacific Corp. said Thursday its first-quarter profit rose 11%, as higher prices drove freight revenue up.

Trailer manufacturers said they are turning to new cost-saving features and services to seize the advantage in a market that isn’t expected to grow all that much this year, industry officials said.

LOUISVILLE, Ky. — ThermoKing introduced two new refrigeration units, a new auxiliary power unit and two new wireless products here at the Mid-America Trucking Show.

LOUISVILLE, Ky. — ATDynamics said here Thursday at the Mid-America Trucking Show that its TrailerTail device will be installed on at least 450 refrigerated trailers operated by Prime Inc., one of the nation’s largest refrigerated carriers.

The Insurance Institute for Highway Safety said Thursday that new tests show potential weaknesses in current underride guards on tractor-trailers.

U.S. trailer manufacturers booked 20,357 new orders in January, which was down 20.1% from a year earlier but enough to boost manufacturers’ backlogs, ACT Research reported.

U.S. trailer makers took in more orders for new equipment in 2012 than in any other year since 2006, and said they have a strong enough backlog to keep busy through the middle of this year, even as the economy has cooled.

Canadian freight railroad Canadian Pacific’s fourth-quarter net income fell to C$15 million, or 8 Canadian cents per share, from C$221 million, or C$1.31, a year earlier, on restructuring charges.