<SUBMISSION>
<ACCESSION-NUMBER>0001415601-08-000002
<TYPE>3
<PUBLIC-DOCUMENT-COUNT>2
<PERIOD>20071106
<FILING-DATE>20080115
<DATE-OF-FILING-DATE-CHANGE>20080115
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>Mentzines Stephen
<CIK>0001415601
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>3
<ACT>34
<FILE-NUMBER>001-32385
<FILM-NUMBER>08530664
</FILING-VALUES>
<BUSINESS-ADDRESS>
<PHONE>(212) 231 1000
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>125 WEST 55TH STREET, 22ND FLOOR
<CITY>NEW YORK
<STATE>NY
<ZIP>10019
</MAIL-ADDRESS>
</REPORTING-OWNER>
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>Macquarie Infrastructure CO Trust
<CIK>0001289788
<ASSIGNED-SIC>5172
<IRS-NUMBER>206196808
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>125 WEST 55TH STREET, 22ND FLOOR
<CITY>NEW YORK
<STATE>NY
<ZIP>10019
<PHONE>212-231-1000
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>125 WEST 55TH STREET, 22ND FLOOR
<CITY>NEW YORK
<STATE>NY
<ZIP>10019
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>Macquarie Infrastructure Assets Trust
<DATE-CHANGED>20040510
</FORMER-COMPANY>
</ISSUER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2007-11-06</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001289788</issuerCik>
        <issuerName>Macquarie Infrastructure CO Trust</issuerName>
        <issuerTradingSymbol>MIC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001415601</rptOwnerCik>
            <rptOwnerName>Mentzines Stephen</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>125 W 55TH STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10019</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>LLC Interests</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes></footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Heidi Mortensen, Attorney-in-Fact</signatureName>
        <signatureDate>2007-11-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>poa_110807.txt
<DESCRIPTION>POWER OF ATTORNEY
<TEXT>




                                POWER OF ATTORNEY


     The  undersigned,  Stephen  Mentzines  (the  "Undersigned"),   does  hereby
nominate,  constitute  and  appoint  each of Heidi  Mortensen  and Peter  Stokes
(individually, an "Attorney-in-Fact") as the Undersigned's true and lawful agent
and  attorney-in-fact,  with  full  power  and  authority  of  substitution  and
revocation   and  to  act  singly   hereunder,   in  the   discretion   of  such
Attorney-in-Fact,  in the name of and on behalf of the  Undersigned  as fully as
the Undersigned  could if the Undersigned were present and acting in person,  to
perform any and all acts that may be necessary  or  desirable to complete,  make
and execute any and all required or  voluntary  filings  (the  "Filings")  under
Section 16(a) of the Securities  Exchange Act of 1934, as amended (the "Exchange
Act"), and the applicable rules and regulations thereunder,  with the Securities
and Exchange Commission,  the New York Stock Exchange,  Macquarie Infrastructure
Company  LLC (the  "Company"),  and any other  person  or  entity to which  such
filings may be required  under  Section 16(a) of the Exchange Act as a result of
the  Undersigned's  position as an officer  (including the principal  accounting
officer)  and/or  director  of  the  Company  or the  Undersigned's  "Beneficial
Ownership"  (within the meaning of Section  16(a) of the  Exchange  Act) of more
than ten percent of any class of equity securities of the Company.

     The Undersigned hereby consents to, ratifies and confirms all that the said
Attorney-in-Fact  shall  do or  cause  to be done by  virtue  of this  Power  of
Attorney.  The Undersigned  hereby  acknowledges that the  Attorney-in-Fact,  in
serving in such capacity at the request of the Undersigned, is not assuming, nor
is the Company  assuming,  any of the Undersigned's  responsibilities  to comply
with Section 16 of the Exchange Act.

     This Power of Attorney shall remain in full force and effect from this date
forward for the term of the Undersigned's  service as an officer and/or director
of the  Company  or the  Undersigned's  Beneficial  Ownership  of more  than ten
percent  of any  class of equity  securities  of the  Company  and for such time
thereafter as may be necessary to make any such Filings,  unless earlier revoked
or modified by the Undersigned in writing.  The  Undersigned  hereby revokes all
prior powers of attorney relating to the foregoing acts.

     IN WITNESS  WHEREOF,  the  Undersigned  has  hereunto  signed this Power of
Attorney this 7th day of November, 2007.


                                         By: /s/ Stephen Mentzines
                                             -----------------------------
                                             Name: Stephen Mentzines

</TEXT>
</DOCUMENT>
</SUBMISSION>
