UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934

Date of report (Date of earliest event reported): March 6, 2017

Burlington Northern Santa Fe, LLC

(Exact Name of Registrant as Specified in Its Charter)

(800) 795-2673

(Registrant’s Telephone Number, Including Area Code)

(Not Applicable)

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Item 1.01. Entry into a Material Definitive Agreement.

See description of the Nineteenth Supplemental Indenture in Item 8.01.

Item 2.03. Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

See Item 8.01.

Item 8.01. Other Events.

Burlington Northern Santa Fe, LLC (“BNSF”) entered into an underwriting agreement (the “Underwriting Agreement”) dated March 6, 2017, with J.P. Morgan Securities LLC, Morgan Stanley & Co. LLC and Wells Fargo Securities, LLC, as representatives of the several underwriters listed therein (collectively, the “Underwriters”), pursuant to which BNSF agreed to sell and the Underwriters agreed to purchase, subject to and upon terms and conditions set forth therein, $500,000,000 in aggregate principal amount of 3.250% Debentures due June 15, 2027 and $750,000,000 in aggregate principal amount of 4.125% Debentures due June 15, 2047, as described in the prospectus supplement dated March 6, 2017, filed pursuant to BNSF’s shelf registration statement on Form S-3, Registration No. 333-211220.

The debentures were issued under the Indenture dated as of December 1, 1995, the Fifth Supplemental Indenture dated as of February 11, 2010 and the Nineteenth Supplemental Indenture dated as of March 9, 2017, between BNSF and The Bank of New York Mellon Trust Company, N.A. (formerly known as The Bank of New York Trust Company, N.A.), as successor-in-interest to The First National Bank of Chicago, as trustee, and an officers’ certificate providing for the issuance of the debentures. The Underwriters delivered the debentures against payment on March 9, 2017.

A copy of the Underwriting Agreement, Nineteenth Supplemental Indenture and other documents relating to this transaction are attached as exhibits to this Current Report on Form 8-K and are incorporated herein by reference.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

See Exhibit Index included herewith.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

BURLINGTON NORTHERN SANTA FE, LLC

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