<SUBMISSION>
<ACCESSION-NUMBER>0001293788-04-000021
<TYPE>3
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20041215
<FILING-DATE>20041215
<DATE-OF-FILING-DATE-CHANGE>20041215
<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>600 FIFTH AVENUE, 21ST FLOOR
<CITY>NEW YORK
<STATE>NY
<ZIP>10020
<PHONE>212-548-6555
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>600 FIFTH AVENUE, 21ST FLOOR
<CITY>NEW YORK
<STATE>NY
<ZIP>10020
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>Macquarie Infrastructure Assets Trust
<DATE-CHANGED>20040510
</FORMER-COMPANY>
</ISSUER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>Macquarie Infrastructure Management (USA) INC
<CIK>0001311388
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>0331
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>3
<ACT>34
<FILE-NUMBER>001-32385
<FILM-NUMBER>041205827
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>600 FIFTH AVENUE, 21ST FLOOR
<CITY>NEW YORK
<STATE>NY
<ZIP>10020
<PHONE>212-548-6538
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>600 FIFTH AVENUE, 21ST FLOOR
<CITY>NEW YORK
<STATE>NY
<ZIP>10020
</MAIL-ADDRESS>
</REPORTING-OWNER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2004-12-15</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001311388</rptOwnerCik>
            <rptOwnerName>Macquarie Infrastructure Management (USA) INC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>600 FIFTH AVENUE, 21ST FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10020</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Share of Trust Stock</value>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>100</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">This report is filed by Macquarie Infrastructure Management (USA) Inc., which is currently a 10% owner.  The Reporting Person also may be deemed a director by virtue of its right following the completion of the issuer's initial public offering to nominate one director to the board of directors of Macquarie Infrastructure Company LLC and an alternate for such appointee, and such director, or alternate if applicable, will serve as the chairman of the board of directors of Macquarie Infrastructure Company LLC.  Following the completion of the issuer's initial public offering, John Roberts will serve as the chairman of the board and Shemara Wikramanayake will serve as the alternate chairman.</footnote>
        <footnote id="F2">Each share of trust stock represents one beneficial interest in Macquarie Infrastructure Company Trust.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Peter Stokes, President and CEO</signatureName>
        <signatureDate>2004-12-15</signatureDate>
    </ownerSignature>
</ownershipDocument>

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