Pollak says Railex breaks even at one train a week and is profitable at two or more.

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And his hopes for Railex are as wide as the continent: He wants to expand the service with warehouse hubs in California, Florida and Tennessee.

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Railex picks up produce from farmers up and down the West Coast in refrigerated trucks and stores it in the 212, 000-square-foot refrigerated warehouse in Walulla.

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At one train a week, that's five million fewer gallons per year, and Railex is confident it can fill up to five on the Washington-to-New York line.

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Railex has signed some big customers early, like grocers Wal-Mart (nyse: WMT - news - people ), the nation's biggest retailer, and Ahold (nyse: AHO - news - people ), plus distributors like Sysco (nyse: SSY - news - people ).

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