UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 13D

Information To Be Included in Statements Filed Pursuant to § 240.13d-1(a) and

Amendments Thereto Filed Pursuant to § 240.13d-2(a)*

(Amendment No. 6)

VITRAN CORPORATION INC.

(Name of Issuer)

Common Stock, no par value

(Title of Class of Securities)

92850E107

(CUSIP Number)

Howard A. Kenny

Morgan, Lewis & Bockius LLP

101 Park Avenue

New York, NY 10178

(212) 309-6843

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

October 31, 2013

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because off §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.  ¨

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d-7 for other parties to whom copies are to be sent.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Page 4 of 5 Pages

Item 1. Security and Issuer

Item 1 is hereby amended and restated in its entirety as follows:

This statement on Schedule 13D originally filed on December 31, 2012, as amended by Amendment No. 1 filed on January 23, 2013, Amendment No. 2 filed on January 29, 2013, Amendment No. 3 filed on March 12, 2013, Amendment No. 4 filed on May 31, 2013 Amendment No. 5 filed on September 26, 2013 and Amendment No. 6 filed on November 1, 2013 (as so amended, the “Schedule 13D”), is being filed by the undersigned with respect to common stock, without par value (the “Common Stock”), of Vitran Corporation Inc., an Ontario, Canada corporation (the “Issuer”). The Issuer’s principal executive office is located at 185 The West Mall, Suite 701, Toronto, Ontario, Canada, M9C 5L5.

Item 2. Identity and Background

Item 2 is hereby amended and restated in its entirety as follows:

(a-f) This Schedule 13D is being filed by TransForce Inc. (“TransForce”), a Canada public company and TFI Holdings Inc. (“TFI”), a Canada company and a direct wholly-owned subsidiary of TransForce. TransForce’s and TFI’s principal place of business 8801 Trans-Canada Highway, Suite 500, Saint-Laurent, Quebec, H4S 1Z6. TransForce is a leader in the transportation and logistics industry operating across Canada and the United States.

TFI beneficially owns all 3,278,232 shares of the Common Stock. Due to TransForce’s ownership of 100% of TFI, TransForce may be deemed to beneficially own all shares of the Common Stock held by TFI.

During the last five years, neither TFI nor TransForce has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).

During the last five years, neither TFI nor TransForce has been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and was not and is not as a result of any such proceeding subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

Current information concerning the identity and background of each of the directors and executive officers of TFI and TransForce is set forth in Annex A hereto, which is incorporated by reference in response to this Item 2. To the best of each of TFI and TransForce’s knowledge, during the past five years, none of the directors and executive officers identified on Annex A hereto has been (i) convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors) or (ii) a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and, as a result of such proceeding subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

Item 3. Source and Amount of Funds or Other Consideration

Item 3 is hereby amended and restated in its entirety as follows:

TransForce, through its direct wholly-owned subsidiary, TFI, acquired an aggregate of 2,063,478 shares of Common Stock in open market purchases, including 1,490,300 shares acquired through open market purchases on the Toronto Stock Exchange and 573,178 shares acquired through open market purchases on NASDAQ, for an aggregate purchase price of C$10,540,943.53 between December 17, 2012 and May 28, 2013. On March 7, 2013, TFI sold 500,000 shares of Common Stock in an open market transaction on NASDAQ for a price per share of U.S. $6.20 (an aggregate purchase price of U.S. $3,100,000).

The purchase of shares of the Common Stock was funded through borrowings under TransForce’s general C$800 million credit facility (the “Credit Facility”) with a bank syndicate of 14 lenders led by National Bank Financial as Sole Bookrunner and Co-Lead Arranger, RBC Capital Markets and Bank of America Merrill Lynch in their capacity as co-lead arrangers and National Bank of Canada acting as Administrative Agent.

On October 31, 2013, TransForce entered into a Share Purchase Agreement (the “Share Purchase Agreement”) with Clarke Inc., a Nova Scotia, Canada corporation (“Clarke”) and Quinpool Holdings Partnership, a Nova Scotia partnership and direct wholly-owned subsidiary of Clarke (“Quinpool”), providing for the purchase of 1,714,754 shares of Common Stock from Quinpool at a purchase price of U.S.$4.77 per share. The purchase of the shares was funded through borrowings under the Credit Facility. The shares will be held by TFI. On October 31, 2013, in a separate agreement, TransForce agreed to acquire two freight transportation subsidiaries of Clarke for a purchase price of C$88 million, subject to regulatory approval.

Page 5 of 5 Pages

Item 4. Purposes of Transactions

Item 4 is hereby amended and restated in its entirety as follows:

The information contained in Item 3 above is incorporated herein by reference.

Pursuant to a letter dated September 25, 2013 (the “Letter”), TransForce notified the Issuer of its interest in acquiring all of the issued and outstanding shares of the Issuer, except for shares already owned by TransForce and/or its affiliates, for cash consideration of $4.50 per share on the terms and subject to the conditions set forth in a letter of intent dated the same date (the “Letter of Intent”).

The Letter of Intent sets forth the terms of TransForce’s offer to acquire such shares (the “Acquisition”). The Letter of Intent requests a countersignature from the Issuer by 7:00 a.m. Eastern time on September 30, 2013. On September 29, 2013, the Issuer informed TransForce that it would not execute the Letter at that time.

The foregoing description of the Letter and the Letter of Intent is qualified in its entirety by the terms of the Letter and the Letter of Intent, which are filed as Exhibit B and Exhibit C hereto, respectively, and incorporated herein by reference.

TransForce and TFI intend to review their investment in the Issuer from time to time and, depending upon market conditions and other factors that TransForce and/or TFI may deem material in making an investment decision, TransForce and/or TFI may purchase Common Stock in open market or private transactions, sell all or any portion of the Common Stock currently owned or hereafter acquired by each of TFI or TransForce, either in open market or private transactions, or take other steps to increase or decrease or hedge their investment in the Issuer. In addition, TransForce and TFI may propose, consider or pursue transactions that could result in TransForce acquiring all or a controlling amount of the Issuer’s Common Stock or its business or assets.

On October 31, 2013, TransForce entered into the Share Purchase Agreement described in Item 3 above. TransForce expects that the purchase of the shares pursuant to the Share Purchase Agreement and the entry into the Lock-Up Agreement will support the Acquisition or a similar transaction if TransForce elects to pursue such a Transaction in the future, but TransForce has not committed to pursue any such transaction at this time.

Except as described above, TFI, TransForce and the other persons named in Item 2 above currently have no plans or proposals that relate to or would result in any of the actions specified in clause (a) through (j) of Item 4 of Schedule 13D.

Item 5. Interest in Securities of the Issuer

Item 5 is hereby amended and restated in its entirety as follows:

On March 7, 2013, TFI sold 500,000 shares of Common Stock in an open market transaction as described in Item 3 above.

On October 31, 2013, TFI acquired 1,714,754 shares of Common Stock pursuant to the Share Purchase Agreement described in Item 3 above and Item 6 below.

As a result, as of the date hereof, each of TransForce and TFI may be deemed to beneficially own 3,278,232 shares of Common Stock.

Such shares collectively constitute approximately 19.95% of the total number of shares of Common Stock of the Issuer outstanding as of July 30, 2013, as reported by the Issuer in its Form 10-Q filed with the Commission on August 6, 2013. Except for such shares, neither TFI, TransForce, nor any of the other persons identified in Item 2 above own any shares of Common Stock.

Item 6. Contracts, Arrangements, Understandings or Relationships with respect to the Issuer

On October 31, 2013, TransForce entered into the Share Purchase Agreement, providing for the purchase of 1,714,754 shares of Common Stock at a purchase price of U.S.$4.77 per share from Quinpool. The shares will be held by TFI. The foregoing description of the Share Purchase Agreement is qualified in its entirety by reference to the text of the agreement filed as Exhibit D hereto.

On October 31, 2013, concurrently with the execution of the Share Purchase Agreement, TransForce, Clarke and Quinpool entered into a lock-up agreement (the “Lock-Up Agreement”) pursuant to which Clarke and Quinpool agreed that, if TransForce makes an offer to acquire all or substantially all of the outstanding shares of Common Stock of the Issuer, Clarke and Quinpool will support such offer and deposit under the offer all 418,837 shares owned by them following the sale pursuant to the Share Purchase Agreement and any subsequently acquired shares of Common Stock acquired by them. TransForce does not have the power to vote or direct the vote or to dispose or direct the disposition of such shares. Clarke and Quinpool also agreed not to support any competing acquisition proposal or transfer its shares. The Lock-Up Agreement will terminate if TransForce does not make such offer on or prior to December 29, 2013. The Lock-Up Agreement contains customary representations and warranties. The foregoing description of the Lock-Up Agreement is qualified in its entirety by reference to the text of the agreement filed as Exhibit E hereto.

Item 7. Materials to Be Filed as Exhibits

The Joint Filing Agreement by and between TransForce Inc. and TFI Holdings Inc., dated as of December 30, 2012, is hereby incorporated herein by reference to Exhibit A to the original statement on Schedule 13D filed with the Commission on December 31, 2012.

The Letter dated September 25, 2013 by TransForce Inc. to Vitran Corporation Inc. is incorporated herein by reference to as Exhibit B to Amendment No. 5.

The Letter of Intent dated September 25, 2013 presented by TransForce Inc. to Vitran Corporation Inc. is incorporated herein by reference to as Exhibit C to Amendment No. 5.

The Share Purchase Agreement dated October 31, 2013, by and between TransForce Inc., Clarke Inc. and Quinpool Holdings Partnership is filed as Exhibit D hereto.

The Lock-Up Agreement dated October 31, 2013, by and between TransForce Inc., Clarke Inc. and Quinpool Holdings Partnership is filed as Exhibit E hereto.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated: November 1, 2013

INDEX TO EXHIBITS

ANNEX A

Annex A

Certain Information Regarding Directors and Executive Officers of

TransForce Inc. and TFI Holdings Inc

Transforce Inc.

Directors

Executive Officers

TFI Holdings, Inc.

Directors

Executive Officers