Warren Buffett's Railroad. After setting-out several cars, this eastbound Z-train departs BNSF's Midway Yard. Warren Buffett's Berkshire Hathaway recently acquired a 10.9% stake in BURLINGTON NORTHERN SANTA FE CORP, becoming BNSF's largest shareholder. BNSF ES44DC 7629 is one of BNSF's newest DC GEs wihile BNSF 960, the third unit, was its very first DASH 9-44CW.