IAS Logistics Inc., a specialist in linking over-the-road and air-freight services, is expanding its Texas trucking operation.

Freight that moves by rail instead of highway is estimated to reduce emissions by two-thirds, according to the U.S. Environmental Protection Agency. If just 10 percent of the long-haul freight currently moving by truck could be switched to rail, it would eliminate more than 12 million tons of greenhouse gas emissions per year.