**Exhibit 99.5**

CFO SECTION302CERTIFICATION

I, Claude Mongeau, certify that:

|(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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|    | (c)                                                                                                                                                                                                                                                                                                                         
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|    | (d)                                                                                                                                                                                                                                                                                                                         
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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)                                                                                                                                                                                                                                                                                
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|    | (b)                                                                                                                                                                                                                                                                                
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Date: February 12, 2007

/s/ Claude MongeauClaude MongeauExecutive Vice-President and ChiefFinancial Officer


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