One of Berkshire Hathaway's largest units, BNSF Railway, just named Kathryn Farmer as its first female CEO./Credit:	BNSF

One of Berkshire Hathaway's largest units, BNSF Railway, just named Kathryn Farmer as its first female CEO./Credit: BNSF

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Kathryn Farmer becomes the first woman CEO of an American railroad

One of Berkshire Hathaway's largest units, BNSF Railway, just named Kathryn Farmer as its first female CEO.