July 22, 2011

Media advisory – CN to report and review second-quarter 2011 financial results on July 25, 2011

MONTREAL, July 22, 2011 /PRNewswire/ - CN (TSX: CNR) (NYSE: CNI) will
issue its second-quarter 2011 financial and operating results on July
25, 2011, shortly after 4 p.m. Eastern Time (ET).

CN's senior officers will review the results and the railway's outlook
that afternoon in a 4.30 p.m. ET conference call/webcast.

Parties interested in participating in, or listening to, the
second-quarter 2011 presentation and following question-and-answer
period by telephone should dial 1-800-355-4959 or 416-641-6122 by 4.20
p.m. ET July 25.

Claude Mongeau, president and chief executive officer of CN, will lead
the conference call.

CN will webcast the presentation live and furnish slides supporting the
officers' remarks via the Investors section of its website, www.cn.ca/investors. The slides will be posted just after 4 p.m. ET July 25. A webcast
replay will be available after the call ends.

CN - Canadian National Railway Company and its operating railway
subsidiaries - spans Canada and mid-America, from the Atlantic and
Pacific oceans to the Gulf of Mexico, serving the ports of Vancouver,
Prince Rupert, B.C., Montreal, Halifax, New Orleans, and Mobile, Ala.,
and the key metropolitan areas of Toronto, Buffalo, Chicago, Detroit,
Duluth, Minn./Superior, Wis., Green Bay, Wis., Minneapolis/St. Paul,
Memphis, and Jackson, Miss., with connections to all points in North
America. For more information on CN, visit the company's website at www.cn.ca.