Coal is a major concern for U.S. railroads as Congress debates climate legislation that could affect the nation's coal production. One in five rail jobs is linked to coal shipments, according to the Association of American Railroads. And coal traffic contributes about a quarter of each Class I railroad's total revenue. "Without coal, the U.S. rail network would face a need for vast restructuring with greatly reduced capacity to invest in the nation's rail network infrastructure," said Edward Hamberger, AAR president and chief executive.

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