Exhibit 99.3

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Consent of Independent Registered Public Accounting Firm

The Board of Directors
Canadian National Railway Company

We consent to the incorporation by reference of our reports dated January 31, 2018 with respect to the consolidated balance sheets of Canadian National Railway Company (the “Company”) as of December 31, 2017 and 2016 and the related consolidated statements of income, comprehensive income, changes in shareholders’ equity and cash flows for each of the years in the three-year period ended December 31, 2017, and the related notes (collectively, the “financial statements”), and the effectiveness of internal control over financial reporting as of December 31, 2017, which reports appear in the December 31, 2017 annual report on Form 40-F of the Company.

We also consent to the incorporation by reference of such reports in the registration statements (No. 333-5258, No. 333-131856, No. 333-197799, No. 333-7520 and No. 333-204974) on Form S-8 of the Company and in the registration statement (No. 333-208547) on Form F-10 of the Company.

January 31, 2018

Montréal, Canada

*CPA auditor, CA, public accountancy permit No. A123145

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