ROTTERDAM — Railex has nearly completed work on a new track near its 250,000-square-foot facility in the Rotterdam Corporate Park.

The new set of rails is the fourth at the facility and represents a nearly $800,000 investment by the fledgling company, which first opened for business in October 2006.

Paul Esposito, vice president of sales and logistics for Railex, said the tracks will help accommodate a third train the company expects to add in late September. But instead of bringing produce from the company’s warehouse in Wallula, Wash., the new train will be hauling agricultural goods from California’s sun belt.

By next month, Esposito said Railex will open a 200,000-square-foot cold storage facility in Delano Calif., which will begin shipping a variety of sensitive, West Coast-grown produce to the East Coast. These items include everything from lettuce to cherries and grapes, “pretty much whatever the consumer demands,” he said.

Esposito said the climate-controlled trains have already been hauling loads more sensitive than the onions, citrus and potatoes they initially carried. But instead of hauling it from the source in California, trucks have shipped the produce and products north to the company’s facility in Washington, which packages the trains for Rotterdam.

The third train will operate much like the others, with the company’s usual guarantee that product will move from west to east in less than five days. The company expects to haul the equivalent of 400 truckloads of product from its California facility each week.

Esposito said products aboard the Railex trains won’t be limited to produce. The company has already shipped more than 1 million bottles of wine from the Columbia Gorge region on the border of Oregon and Washington.

“They used to have the long haul by truck,” he said, “but they saw the benefit of utilizing the Railex system.”