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The average national price of diesel fuel gained another 5.9 cents from last week in rising to $2.685 a gallon, a sixth straight increase, the Department of Energy said Monday.

Cascade Sierra Solutions, a nonprofit group that promotes the sale of products to help truck drivers save fuel and reduce emissions, said it has opened the first of what could be as many as eight “green truck technology” showrooms along the Interstate 5 corridor in Oregon, Washington and California.

The Environmental Protection Agency has proposed for the first time sharp cuts in exhaust emissions from railroad locomotive and marine engines in a plan a spokesman said would “follow exactly the same pattern” as environmental regulations for truck engines.

Air cargo shipments rose 2.1% in January from a year earlier, with about an even split in gains in domestic and international shipments, the Air Transport Association said.

The average national price of diesel fuel jumped 7.5 cents to $2.626 a gallon, while gasoline soared 12.2 cents from last week to $2.505, the Department of Energy said Monday.

The Environmental Protection Agency said it would soon issue its guidance for engine manufacturers on the conditions they must meet in order to sell engines that use selective catalytic reduction to meet emission regulations.

As the trucking industry shifts to the next generation of low-emission diesel engines, some fleet maintenance managers said they have experienced few problems with the transition, which presents maintenance adjustments for heavy-duty and medium-duty trucks alike.

Retail diesel fuel’s national average price rose for a fourth straight week, jumping 6 cents to $2.551 a gallon, the Department of Energy said Monday.

The Ontario Trucking Association said Tuesday that an apparent diesel fuel shortage in the province was causing concern to truckers.