**Exhibit      99.5**

**CFO      SECTION 302 CERTIFICATION**

| (1)   | I                  have reviewed this annual report on Form 40-F of Canadian National                  Railway                  Company; |
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| (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; |
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| (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                  issuer as                  of, and for, the periods presented in this                  report; |
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| (4)   | The                    issuer’s other certifying officer 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 issuer and have: |
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| (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 issuer, 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; |
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| (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; |
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| (c)   | Evaluated                    the effectiveness of the issuer’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 |
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| (d)   | Disclosed                    in this report any change in the issuer’s internal control over financial                    reporting that occurred during the period covered by the annual                    report                    that has materially affected, or is reasonably likely to materially                    affect, the issuer’s internal control over financial reporting;                    and |
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| (5)   | The                      issuer's other certifying officer and I have disclosed, based                      on our most                      recent evaluation of internal control over financial reporting,                      to the                      issuer's auditors and the audit committee of the issuer's board                      of                      directors (or persons performing the equivalent                      functions): |
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| (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 issuer’s ability to record,                    process, summarize and report financial information;                    and |
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| (b)   | Any                    fraud, whether or not material, that involves management or other                    employees who have a significant role in the issuer's internal                    control                    over financial reporting. |
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|  | /s/                    Claude MongeauClaude                    MongeauExecutive                    Vice-President and ChiefFinancial                      Officer |
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