Burlington Northern Santa Fe Corporation was incorporated in the State of Delaware on December 16, 1994. On February 12, 2010, Berkshire Hathaway Inc., a Delaware corporation (Berkshire), acquired 100% of the outstanding shares of Burlington Northern Santa Fe Corporation common stock that it did not already own. The acquisition was completed through the merger (Merger) of a Berkshire wholly-owned merger subsidiary and Burlington Northern Santa Fe Corporation with the surviving entity renamed Burlington Northern Santa Fe, LLC (BNSF). Further information about the Merger is incorporated by reference from Note 1 to the Consolidated Financial Statements.
BNSF is a holding company that conducts no operating activities and owns no significant assets other than through its interests in its subsidiaries. Through its subsidiaries, BNSF is engaged primarily in the freight rail transportation business. At December 31, 2018, BNSF and its subsidiaries had approximately 45,000 employees. The rail operations of BNSF Railway Company (BNSF Railway), the Company's principal operating subsidiary, comprise one of the largest railroad systems in North America.
Further discussion of the Company's business, including equipment and its business units, is incorporated by reference from Item 2, "Properties".