"We haven't had word from freight yet and we've got to get the cars back, " McLaren boss Martin Whitmarsh said.

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The Outer Hebrides Transport Group said removing road equivalent tariff (RET) from freight would lead to a 175% increase in travel costs from April.

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Now, with an increased domestic interest in ethanol and the U.S. Department of Agriculture expecting declining exports, the company will also have to contend with competition from freight trains and their easier access to mid-America.

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