**Exhibit 31.2**




**CERTIFICATION
      PURSUANT TO**


**SECTION
      302 OF THE SARBANES-OXLEY ACT OF 2002**





I,
      Francis T. Joyce, certify that:





1.    I
      have
      reviewed this annual report on Form 10-K of Macquarie Infrastructure Company
      Trust and Macquarie Infrastructure Company LLC (the “registrant”);





2.    Based
      on
      my knowledge, this report does not contain any untrue statement of a material
      fact or omit to state a material fact necessary to make the statements made,
      in
      light of the circumstances under which such statements were made, not misleading
      with respect to the period covered by this report;





3.    Based
      on
      my knowledge, the financial statements, and other financial information included
      in this report, fairly present in all material respects the financial condition,
      results of operations and cash flows of the registrant as of, and for, the
      periods presented in this report;





4.    The
      registrant’s other certifying officers and I are responsible for
      establishing and maintaining disclosure controls and procedures (as defined
      in
      Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial
      reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for
      the registrant and have:




a)    Designed
        such disclosure controls and procedures, or caused such disclosure controls
        and
        procedures to be designed under our supervision, to ensure that material
        information relating to the registrant, including its consolidated subsidiaries,
        is made known to us by others within those entities, particularly during
        the
        period in which this report is being prepared;
  b)    Designed
        such internal control over financial reporting, or caused such internal control
        over financial reporting to be designed under our supervision, to provide
        reasonable assurance regarding the reliability of financial reporting and
        the
        preparation of financial statements for external purposes in accordance with
        generally accepted accounting principles;
  c)    Evaluated
        the effectiveness of the registrant’s disclosure controls and procedures and
        presented in this report our conclusions about the effectiveness of the
        disclosure controls and procedures, as of the end of the period covered by
        this
        report based on such evaluation; and
  d)    Disclosed
        in this report any change in the registrant’s internal control over financial
        reporting that occurred during the registrant’s most recent fiscal quarter (the
        registrant’s fourth fiscal quarter in the case of an annual report) that has
        materially affected, or is reasonably likely to materially affect, the
        registrant’s internal control over financial reporting; and


5.    The
      registrant’s other certifying officers and I have disclosed, based on our most
      recent evaluation of internal control over financial reporting, to the
      registrant’s auditors and the audit committee of registrant’s board of directors
      (or persons performing the equivalent functions):




a)    All
      significant deficiencies and material weaknesses in the design or operation
      of
      internal control over financial reporting which are reasonably likely to
      adversely affect the registrant’s ability to record, process, summarize and
      report financial information; and




b)    Any
      fraud, whether or not material, that involves management or other employees
      who
      have a significant role in the registrant’s internal control over financial
      reporting.




Date: March 1, 2007/s/
                Francis T.
                JoyceFrancis
                T. JoyceChief Financial Officer