Exhibit
      4A.6





I.G./


Register
      No.
      4,199








**COMMERCIAL
      PLEDGE AGREEMENT ON SHARES**





**COMMERCIAL
      PLEDGE AGREEMENT ON SHARES OF**





**ADMINISTRADOR
      FINANCIERO DE TRANSANTIAGO, S.A.**





**PLEDGED
      TO**





**INVERSIONES
      ALSACIA S.A. *ET AL***








In
      Santiago de Chile, on this 5th day of February
      in
      the year 2007, before me, **RAÚL IVÁN PERRY PEFAUR**, a local
      Notary Public with offices located at Calle Ahumada 312, suite 36, incumbent
      Notary of the 21st Notarial
      Office of
      Santiago, appeared **JOSÉ********MANUEL
      MENA VALENCIA,** a Chilean citizen, married, industrial civil engineer by
      profession, holder of national identification card No. 6,196,849-0, verifiably
      representing the **BANCO DEL ESTADO DE CHILE**, an autonomous
      entity of the Chilean government, tax identification No. 97,030,000-7, both
      domiciled in this city of Santiago at Avenida del Libertador Bernardo O’Higgins
      No. 1111; **JULIO GUZMAN HERRERA**, a Chilean citizen, married,
      commercial engineer by profession, holder of





national
      identification card No. 3,673,092-9, verifiably representing the **BANCO
      DE CHILE**, a corporation engaged in the banking business, tax
      identification No. 97,004,000-5, both domiciled in this city of Santiago at
      Calle Ahumada No. 251; **OSCAR VON CHRISMAR CARVAJAL**, a Chilean
      citizen, married, an engineer by profession, holder of national identification
      card No. 6,926,511-1, verifiably representing the **BANCO
      SANTANDER-CHILE**, a corporation engaged in the banking business, tax
      identification No. 97,036,000-K, both domiciled in this city of Santiago at
      Calle Bandera No. 140; **MARIO GOMEZ DUBRAVCIC,**a Chilean
      citizen, married, commercial engineer by profession, holder of national
      identification card No. 5,865,947-9, verifiably representing the **BANCO
      DE CREDITO E INVERSIONES**, a corporation engaged in the banking
      business, tax identification No. 97,006,000-6, both domiciled in this city
      of
      Santiago at Calle Huérfanos No. 1134; **RAUL LUPERCIO VÉJAR********OLEA**,
      a Chilean citizen, married, civil engineer by profession, holder of national
      identification card No. 6,580,740-8, verifiably representing **SONDA
      S.A.**, a corporation engaged in data processing services, tax
      identification No. 83,620,000-4, both domiciled in this city of Santiago at
      Calle Teatinos No. 500, and **CLAUDIO CISTERNAS DUQUE**, a Chilean
      citizen, married, commercial engineer by profession, holder of national
      identification card No. 10,174,449-3 and **MARIA ANGELICA SILVA
      ARRUE**, a Chilean citizen, married, accountant by profession, holder of
      national identification card No. 6,651,290-8,





both
      verifiably
      representing **PROMOTORA CMR FALABELLA S.A.**, a corporation
      engaged in lending, tax identification No. 96,743,000-6, all domiciled in this
      city of Santiago at Calle Ahumada No. 236, 7th floor, all
      jointly
      for purposes of this agreement being called the “Shareholders” or the “Pledge
      Debtors”, parties of the first part, and as parties of the second part,
**RICARDO JOSE BARTEL JEFFERY,**a Chilean citizen, holder of
      national identification card No. 8,741,336-5, verifiably representing
**INVERSIONES ALSACIA S.A.**, tax identification No. 99,577,400-3,
      a corporation legally organized and existing under Chilean law, both domiciled
      at Calle Marchant Pereira No. 10, 20th floor, suite
      2001,
      Town of Providencia; **ANDRES OCAMPO BORRERO,**a Colombian
      citizen, holder of alien identification card No. 21,917,402-0, and
**HECTOR DEL TRANSITO MOYA MARTIN**, a Chilean citizen, holder of
      national identification card No. 6,076,632, both verifiably representing
**SU BUS CHILE, S.A.,**taxpayer identification No. 21,918,402-0, a
      corporation organized and existing under the laws of Chile, all domiciled in
      the
      city of Santiago at Calle Santa Lucia No. 324, suites 41 and 42; **MANUEL
      ULISES NAVARRETE MUÑOZ,**a Chilean citizen, holder of national
      identification card No. 4,462,201-7, verifiably representing **BUSES GRAN
      SANTIAGO, S.A.,**taxpayer identification No.
      99,557,450-0,





a
      corporation
      organized and existing under the laws of Chile, both domiciled in the city
      of
      Santiago at Calle Catedral No. 1712, 3rd floor, suite
      4;
**RICARDO JOSE BARTEL JEFFREY**,****a Chilean
      citizen, holder of national identification card No. 8,741,336-5, verifiably
      representing **EXPRESS DE SANTIAGO,
      S.A.**,****taxpayer identification No. 99,577,390-2, a
      corporation organized and existing under the laws of Chile, both domiciled
      in
      the Town of Providence at Calle Marchant Pereira No. 10, floor 20, suite 2001;
      **MANUEL ULISES NAVARRETE MUÑOZ,**a Chilean citizen, holder of
      national identification card No. 4,462,201-7, verifiably representing
**BUSES METROPOLITANA, S.A.**,****taxpayer
      identification No. 99,557,440-3, a corporation organized and existing under
      the
      laws of Chile, both domiciled in the city of Santiago at Calle Catedral No.
      1712, 3rd floor,
      suite 4; Mr. **RAMON YAVAR BASCUÑAN**, a Chilean citizen, married,
      civil engineer by profession, holder of national identification card No.
      6,758,105-9 and Mr. **MARCOS RETAMAL MUÑOZ**, a Chilean citizen,
      married, commercial engineer by profession, holder of national identification
      card No. 14,268,425-K, both verifiably representing **REDBUS URBANO
      S.A.**, tax identification number 99,578,170-0, a corporation organized
      and existing under the laws of Chile, all domiciled at Avenida Panamericana
      Norte No. 9800





in
      the Town of
      Quilicura; Mr. **LUIS BARAHONA MORAGA**, a Chilean citizen, holder
      of national identification card No. 8,711,413-9 and Mr. **JORGE ROLANDO
      GÓMEZ PÉREZ**, a Chilean citizen, holder of national identification card
      No. 6,051,829-7, both verifiably representing **SERVICIOS DE TRANSPORTE DE
      PERSONAS SANTIAGO S.A.**, tax identification number 99,559,010-7, a
      corporation organized and existing under the laws of Chile, all domiciled at
      Calle Abdón Cifuentes No. 51 in the city of Santiago; **ROBERTO HERNAN
      RODRIGUEZ SILVA**, holder of national identification card No.
      10,577,000-6, verifiably representing **UNION DEL TRANSPORTE
      S.A.**, tax identification number 99,577,940-4, a corporation organized
      and existing under the laws of Chile, both domiciled at Calle Compañía No. 1390,
      suite 414, in the city of Santiago; **SIMON ABELARDO DOSQUE SAN
      MARTIN**, holder of national identification card No. 5,800,674-2,
      verifiably representing **COMERCIAL NUEVO MILENIO S.A.**, tax
      identification number 99,546,310-5, a corporation organized and existing under
      the laws of Chile, both domiciled at Avenida Libertador Bernardo O’Higgins No.
      1948, in the city of Santiago; and **JOSE GABRIEL MARTINEZ MUÑOZ**,
      a Chilean citizen, holder of national identification card No. 5,550,804-6 and
      **ADRIANA DEL CARMEN TRONCOSCO LIZANA**, a Chilean citizen, holder
      of national identification card No.





5,799,135-6,
      both
      verifiably representing **TRANS ARAUCARISAS S.A.,**tax
      identification number 99,578,170-0, a corporation organized and existing under
      the laws of Chile, all domiciled at Los Nogales No. 2845 in the Town of La
      Pintana, also hereinafter referred to as the “Pledge Creditors”. The appearing
      parties named are all of legal age, have accredited their identities by
      exhibiting the aforementioned identification cards, and state that they have
      agreed to make, as they do in fact make the following commercial pledge
      agreement, in accordance with Articles 813 and following of the Commercial
      Code.
**Clause One. Background – 1)**The Shareholders are currently
      shareholders of the closed corporation known as **ADMINISTRADOR FINANCIERO
      DE TRANSANTIAGO S.A.**,****subject to the laws of open
      or publicly-held corporations that support the banking industry, hereinafter
      referred to indistinctly as the “Corporation” or “AFT”, founded and established
      by a public instrument dated June 8, 2005, executed before Raúl Iván Perry
      Pefaur, Notary in Santiago, an extract of which is recorded on page 20,009,
      number 14,486 of the Registry of Trade of the Custodian of Real Estate of
      Santiago for the year 2005, and was also published in the Official Gazette
      of
      June 14th of
      that same year. **2)**José Manuel Mena Valencia declares that the
      BANCO DEL ESTADO DE CHILE is currently sole owner, among others, of 210,000
      shares issued by AFT, as officially shown in stock certificate number 001 of
      June 8, 2005; Ignacio Ruiz-Tagle Vergara declares that the BANCO SANTANDER-CHILE
      is currently sole owner, among others, of 200,000 shares issued by AFT, as
      officially shown in stock certificate number 002 of June 8, 2005; Julio Guzmán
      Herrera declares





that
      the BANCO DE
      CHILE is currently sole owner, among others, of 200,000 shares issued by AFT,
      as
      officially shown in stock certificate number 003 of June 8, 2005; Mario Gómez
      Dubravcic declares that the BANCO DE CREDITO E INVERSIONES is currently sole
      owner, among others, of 200,000 shares issued by AFT, as officially shown in
      stock certificate number 004 of June 8, 2005; Raúl Lupercio Véjar Olea declares
      that SONDA S.A. is currently sole owner, among others, of 95,000 shares issued
      by AFT, as officially shown in stock certificate number 005 of June 8, 2005,
      and
      Claudio Cisternas Duque and María Angélica Silva Arrúe declare that PROMOTORA
      CMR FALABELLA S.A. is currently sole owner, among others, of 95,000 shares
      issued by AFT, as officially shown in stock certificate number 006 of June
      8,
      2005. The shares of the Shareholders in the Corporation, hereinafter referred
      to
      all together as the “Shares”, are validly recorded in the names of each of the
      corporations in the pertinent Registry of Shareholders of the Corporation;
      said
      shares are registered, common, without nominal value, of equal value and all
      of
      one same and sole series. **3)**Per resolution number 15 of 2004
      issued by the Ministry of Transportation & Telecommunications, hereinafter
      referred to as the “Ministry”, the Basic Conditions and Specifications of the
      Public Bid respecting the Supplementary Financial Administration Services
      Contract for the funds of the public passenger transportation system of
      Santiago, hereinafter referred to as the “AFT Bid Specifications 2004”, were
      approved. **4)**Per resolution number 897 of April 18, 2005, of
      the Ministry, the awarding of AFT Bid Specifications 2004 was approved, said
      award having been made to the Banco del Estado de Chile. **5)**On
      July 28, 2005, the Corporation and the Ministry entered into
      the





Supplementary
      Financial Administration Services Contract for the funds of the public passenger
      transportation system of Santiago, hereinafter referred to as the “AFT
      Agreement”, which was approved by Special Resolution number 1853 of 2005 of the
      Ministry. **Clause Two. PURPOSE OF THE AGREEMENT.**By this
      agreement, the Shareholders, duly represented as described above, constitute
      a
      commercial pledge in favor of the Pledge Creditors, in accordance with Articles
      813 et seq. of the Commercial Code, and pursuant to the terms and conditions
      set
      forth above, on the Shares owned by them, as itemized and described in Clause
      One of this instrument, for the purpose of guaranteeing the full, effective,
      faithful and timely performance of each and every one of the obligations
      contracted by the Corporation under the AFT Agreement and the mandates conferred
      by the Pledge Creditors in their capacities as providers of transportation
      services, conforming with what is stipulated in the aforementioned AFT
      Agreement, and likewise by virtue of any other document that may supplement
      the
      subject agreement in the future; the subject pledge also covers the
      reimbursement, if any, of all costs and expenses, legal and extra-legal,
      including attorneys’ fees, if any, that may be incurred in connection with any
      proceedings or transfer of this pledge. **Clause Three. NON-EXISTENCE OF
      LIENS AND/OR ENCUMBRANCES ON THE PLEDGED SHARES.**The Shareholders
      likewise undertake not to constitute or permit any lien or encumbrance on,
      or
      otherwise engage in any act or make any contract respect the Shares pledged
      by
      this instrument, whether such lien, encumbrance, act or contract pertains to
      all
      of the Shares or a part thereof, without the prior express and written approval
      of the Pledge Creditors, and pursuant to the terms of the within Agreement.
      The
      parties appearing declare that the term “lien” means any real guarantees or any
      obligation, encumbrance, prohibition, condition, rights granted to
      third-parties, attachments, impediments or









restrictions
      that
      may affect or impede or limit the free use, enjoyment and disposal of the
      Shares. **Clause Four. DELIVERY OF SHARES AND ACCEPTANCE.**The
      parties appearing declare in this agreement that the Pledge Debtors shall
      deliver to the full satisfaction of the Pledge Creditors through their
      representatives designated in the introduction of this instrument, certificates
      Nos. 001, 002, 003, 004, 005 and 006 to the Banco del Estado de Chile, the
      Banco
      Santander-Chile, the Banco de Chile, the Banco de Crédito e Inversiones, and the
      corporations known as Sonda S.A. and Promotora CMR Falabella S.A., respectively,
      issued by the Corporation to whom the shares pledged in the present instrument
      belong. Likewise, Ricardo José Bartel Jeffery, Andrés Ocampo Borrero, Héctor del
      Tránsito Moya Martín, Manuel Ulises Navarrete Muñoz, Ramón Yávar Bascuñan,
      Marcos Retamal Muñoz, Luis Barahona Moraga, Jorge Rolando Gómez Pérez, Roberto
      Hernán Rodríguez Silva, Simón Abelardo Dosque San Martín, José Gabriel Martínez
      Muñoz and Adriana del Carmen Troncoso Lizana, in the name and on behalf of the
      Pledge Creditors, accept the pledge of shares described herein and prohibition
      of establishing any liens and/or encumbrances thereon, and acquire for their
      respective principals the real right of pledge. **Clause Five. EXTENT OF
      THE PLEDGE.**The pledge and the restrictions and prohibitions made in
      this instrument include and extend *ipso jure* to any appreciation the
      shares might undergo, and include but are not limited to paid shares,
      preferential rights or options of any kind, whether of preferential subscription
      to shares, stock-convertible bonds or any other securities that confer future
      rights on the Corporation or on any successor or substitute corporation or
      entity. Likewise, in the case of issuance of new paid shares, any new securities
      that may be issued with respect to the pledge





presently
      made are
      understood to be affected. The Pledge Debtors irrevocably authorize the Pledge
      Creditors, on behalf of whom the named representatives accept, to request from
      the Corporation or its successor corporation or substitute entity, and for
      withdrawing and receiving from such corporation, any new stock certificates
      or
      other securities that may be issued as a consequence of an issuance of paid
      shares or exchange of shares for the issuance of new shares for any reason,
      without having to be delivered by the Corporation or any successor or substitute
      corporation or entity to the Pledge Debtors, with the Pledge Creditors being
      obligated to immediately request a Notary Public to give notice of the pledge
      agreement to record said encumbrance on these new shares in the Registry of
      Shareholders of the Corporation or any successor or substitute corporation.
      With
      respect to the ownership rights pertaining to the Shares, these rights will
      belong to the Pledge Debtors, who may collect any distributions on the pledged
      Shares that relate to dividends declared on the net earnings for the last
      business year. Without prejudice to what is stated above, in the event of any
      non-performance of any of the obligations guaranteed under Clause Two hereof,
      the Pledge Creditors may immediately demand the enforcement of the pledge made
      in this instrument. Any non-performance by the Corporation will not require
      verification to the corporation issuing the Shares or any successor or
      replacement corporation, rather, a written notice of non-performance issued
      by
      the Notary of the corporation issuing the Shares or any successor or replacement
      corporation, with a copy to the Pledge Debtors will therefore suffice. This
      latter circumstance will not require verification to the corporation issuing
      the
      Shares or any successor or replacement corporation. Commencing from the date
      of
      said notice and on the merits of it alone, the Pledge Creditors
      may





demand
      that the
      corporation, or any successor or replacement corporation, collect dividends
      and
      earnings that the holder or owner of the Shares is due, and for such purposes,
      the corporation or any successor or replacement corporation shall be empowered
      to pay said amounts to the Pledge Creditors, thereby releasing the Pledge
      Debtors from any liability to the Corporation, or its successor or replacement,
      as the entity issuing the shares that have been pledged in this instrument,
      with
      respect to those payments. **Clause Six. PRESERVATION OF THE RIGHTS OF THE
      PLEDGE DEBTORS.**The Pledge Debtors shall maintain full exercise of the
      right to participate in the General Meetings of Shareholders of the Corporation
      or any successor or replacement corporation, as a full member, and shall also
      maintain full exercise of any other rights corresponding to them that are
      different from those mentioned in Clause Five above. However, for approving
      any
      amendment to the by-laws of the Corporation the Pledge Debtors or any successor
      or replacement corporation that may affect the pledge and prohibitions
      constituted hereunder, in terms of reducing in a relevant manner the value
      of
      the guarantee, the prior written authorization of the Pledge Creditors shall
      be
      required, and the Pledge Creditors may not deny or delay such authorization
      without reasonable and due cause. **Clause Seven. TRANSFORMATION OF THE
      CORPORATION.**In the event of any break-up, merger or transformation of
      the corporation issuing the Shares previously authorized in writing by the
      Pledge Creditors in the manner stipulated in the preceding clause, the pledge
      and the restrictions and the prohibitions established hereunder shall extend
      to
      all of the shares of any new corporation or corporations that might be formed
      as
      a result of a break-up or merger, or of the surviving companies existing after
      the break-up or merger, pertinent to the rights or investment, as the case
      may
      be, in the transformed corporation. The Pledge Creditors are exclusively
      authorized to withdraw directly









through
      any of their
      authorized representatives or through a Notary Public who is petitioned in
      their
      name, the corresponding stock certificates in all of the preceding cases, and
      to
      request the recording of this pledge and prohibition(s) in the appropriate
      registries of shareholders, with the Pledge Debtors consequently waiving its
      right to request such delivery to itself or to another party. **Clause
      Eight. COMMERCIAL PLEDGE.**The commercial pledge made in this instrument
      is constituted in accordance with the provisions embodied in Articles 813 et
      seq. of the Commercial Code, and in accordance with Article Two hereof, and
      further in accordance with Articles 2384 et seq. of the Civil Code.
**Clause Nine. DECLARATION OF OWNERSHIP.**Each of the Pledge
      Debtors declare that it is the sole and exclusive owner of the pledged shares;
      that these shares are duly recorded in its name in the Registry of Shareholders
      of the Corporation and that all of them are duly paid, and that the Pledge
      Debtors have the corresponding authorizations and approvals required by law.
      Likewise, the Pledge Debtors declare that the pledged shares are free and clear
      of any and all liens, encumbrances, obligations, judgments, restrictions,
      limitations, attachments, injunctions, resolutory actions or preferential
      third-party rights, save for the pledge that is made hereunder to the Pledge
      Creditors, and that the pledge shares are not affected by any options, promises
      of sale, conditional or term sales, or any other act or contract that has or
      might have as its purpose the transfer of ownership of said shares, and that
      no
      impediment exists that might affect their free disposal or the making of this
      pledge and prohibition on liens and sales. **Legal Status.**The
      legal status of Manuel Ulises Navarrete Muñoz to act in representation of Buses
      Gran Santiago S.A. is embodied in the public instrument of June 2,
      2006,





executed
      before
      Osvaldo Pereira González, Notary in Santiago. The legal status of Simon Alberto
      Dosque San Martín to act in representation of Comercial Nuevo Milenio S.A. is
      embodied in the public instrument of May 4, 2006, executed before Alberto
      González Caamaño, Notary in Santiago. The legal status of Manuel Ulises
      Navarrete Muñoz to act in representation of Buses Metropolitana S.A. is embodied
      in public instrument of June 2, 2006, executed before Osvaldo Pereira González,
      Notary in Santiago. The legal status of Mr. Andrés Ocampo Borrero and Mr. Héctor
      del Tránsito Martín to act in representation of Su Bus Chile S.A. is embodied in
      the public instrument of September 26, 2005, executed before Notary Patricio
      Raby Benavente. The legal status of Ricardo José Bartel to act in representation
      of Express de Santiago Uno S.A. is embodied in the public instrument of June
      2,
      2006, executed before Osvaldo Pereira González, Notary in Santiago. The legal
      status of Manuel Ricardo José Bartel Jeffery to act in representation of Alsacia
      S.A. is contained in the public instrument of February 22, 2006, executed before
      Antonieta Mendoza Escalas, Notary in Santiago. The legal status of Mr. Luis
      Barahona Moraga and Mr. Jorge Rolando Gómez Pérez to act in representation of
      Servicio de Transporte de Personas Santiago S.A. is embodied in the public
      instrument of July 15, 2004, executed before Notary Pamela Hernández Machuca.
      The legal status of Roberto Hernán Rodríguez Silva to act in representation of
      Unión del Transporte S.A. is contained in the public instrument of February 22,
      2005, executed before Notary Félix Jara Cadot. The legal status of José Gabriel
      Martínez Muñoz and Adriana del Carmen Troncoso Lizana to act in representation
      of





Trans
      Araucaia S.A.
      is embodied in the public instrument of January 27, 2006, executed before Juan
      Ricardo San Martín Urrejola, Notary in Santiago. The legal status of Ramón Yávar
      Bascuñan and Marcos Retamal Muñoz to act in representation of Redbus Urbano S.A.
      is embodied in the public instrument of December 1, 2005, executed before
      Patricio Zaldívar Mackenna, Notary in Santiago. The legal status of Raúl
      Lupercio VéjarOlea
      to act in representation of Sonda S.A. is contained in the public instrument
      of
      June 3, 2004, executed before Notary René Benavente Cash. The legal status of
      José Manuel Mena Valencia Muñoz to act in representation of the Banco del Estado
      de Chile is embodied in Treasury Department Supreme Decree No. 754 of 1995,
      published in the Official Gazette of August 4, 1995. The legal status of Julio
      Guzmán Herrera to act in representation of the Banco de Chile is embodied in the
      public instrument of March 4, 2002, executed before René Benavente Cash, Notary
      in Santiago. The legal status of Oscar Von Chrismar Carvajal to act in
      representation of the Banco Santander-Chile is embodied in the public
      instruments of July 25, 2002, and July 23, 2003, both executed before Nancy
      de
      la Fuente Hernández, Notary in Santiago. The legal status of Mario Gómez
      Dubravcic to act in representation of the Banco de Crédito e Inversiones is
      contained in the public instruments of May 30, 2005, and August 1, 2006, both
      executed before Alberto Mozó Aguilar, Notary in Santiago. The legal status of
      Claudio Cisternas Duque and María Angélica Silva Arrué to act in representation
      of Promotora CMR Falabella S.A. is embodied in the public instrument of October
      8, 2004, executed before Notary Alberto Mozó Aguilar.








IN
      WITNESS WHEREOF, the instrument was signed
      after having been read. This instrument will be recorded in the Register of
      Public Instruments for the current month under the number indicated. A copy
      is
      being issued. I so attest.




By:
              /s/
                  Oscar von ChrismarName:
              Oscar
                  von ChrismarChief
                  Executive Officer