Exhibit 99.1

Kansas City Southern Stockholders Approve Merger With CP

KANSAS CITY, Mo.—(BUSINESS WIRE)—Kansas City Southern (NYSE: KSU) (“KCS”) announced that the Company’s stockholders have voted toapprove the previously announced combination with Canadian Pacific Railway Limited (TSX: CP) (NYSE: CP) (“CP”) at today’s virtual Special Meeting of Stockholders (“Special Meeting”). Of the 64.5 million shares voting atthe Special Meeting, approximately 99.6% were cast in favor of the adoption of the proposed merger agreement.

The transaction is expected to close onTuesday, December 14, 2021. KCS stockholders will receive $90 in cash and 2.884 CP shares for each KCS common share held and $37.50 in cash for each KCS preferred share held. Immediately upon close, ownership of KCS will be held in a votingtrust pending the Surface Transportation Board’s review and approval of CP’s proposed control of KCS, which is expected to occur in the fourth quarter of 2022.

On December 8, CP’s stockholders voted to approve the issuance of the CP common shares to KCS stockholders in connection with the proposed merger.

For information on the benefits of a CP-KCS combination, visit FutureForFreight.com.

FORWARD LOOKING STATEMENTS AND INFORMATION

This newsrelease includes certain forward looking statements and forward looking information (collectively, “FLI”) to provide CP and KCS stockholders and potential investors with information about CP, KCS and their respective subsidiaries andaffiliates, including each company’s management’s respective assessment of CP, KCS and their respective subsidiaries’ future plans and operations, which FLI may not be appropriate for other purposes. FLI is typically identified bywords such as “anticipate”, “expect”, “project”, “estimate”, “forecast”, “plan”, “intend”, “will”, “target”, “believe”, “likely” andsimilar words suggesting future outcomes or statements regarding an outlook. All statements other than statements of historical fact may be FLI.

Althoughwe believe that the FLI is reasonable based on the information available today and processes used to prepare it, such statements are not guarantees of future performance and you are cautioned against placing undue reliance on FLI. By its nature, FLIinvolves a variety of assumptions, which are based upon factors that may be difficult to predict and that may involve known and unknown risks and uncertainties and other factors which may cause actual results, levels of activity and achievements todiffer materially from those expressed or implied by these FLI, including, but not limited to, the following: the timing and completion of the transaction; the realization of anticipated benefits and synergies of the transaction and the timingthereof; the success of integration plans; the focus of management time and attention on the transaction and other disruptions arising from the transaction; changes in business strategy and strategic opportunities; estimated future dividends;financial strength and flexibility; debt and equity market conditions, including the ability to access capital markets on favourable terms or at all; cost of debt and equity capital; potential changes in the CP share price which may negativelyimpact the value of consideration offered to KCS stockholders; the ability of management of CP, its subsidiaries and affiliates to execute key priorities, including those in connection with the transaction; general Canadian, U.S., Mexican and globalsocial, economic, political, credit and business conditions; risks associated with agricultural production such as weather conditions and insect populations; the availability and price of energy commodities; the effects of competition and pricingpressures, including competition from other rail carriers, trucking companies and maritime shippers in

Canada, the U.S. and Mexico; North American and global economic growth; industry capacity; shifts in market demand; changes in commodity prices and commodity demand; uncertainty surroundingtiming and volumes of commodities being shipped; inflation; geopolitical instability; changes in laws, regulations and government policies, including regulation of rates; changes in taxes and tax rates; potential increases in maintenance andoperating costs; changes in fuel prices; disruption in fuel supplies; uncertainties of investigations, proceedings or other types of claims and litigation; compliance with environmental regulations; labour disputes; changes in labour costs andlabour difficulties; risks and liabilities arising from derailments; transportation of dangerous goods; timing of completion of capital and maintenance projects; sufficiency of budgeted capital expenditures in carrying out business plans; servicesand infrastructure; the satisfaction by third parties of their obligations; currency and interest rate fluctuations; exchange rates; effects of changes in market conditions and discount rates on the financial position of pension plans andinvestments; trade restrictions or other changes to international trade arrangements; the effects of current and future multinational trade agreements on the level of trade among Canada, the U.S. and Mexico; climate change and the market andregulatory responses to climate change; ability to achieve commitments and aspirations relating to reducing greenhouse gas emissions and other climate-related objectives; anticipated in-service dates; successof hedging activities; operational performance and reliability; customer, shareholder, regulatory and other stakeholder approvals and support; regulatory and legislative decisions and actions; the adverse impact of any termination or revocation bythe Mexican government of Kansas City Southern de Mexico, S.A. de C.V.’s Concession; public opinion; various events that could disrupt operations, including severe weather, such as droughts, floods, avalanches and earthquakes, and cybersecurityattacks, as well as security threats and governmental response to them, and technological changes; acts of terrorism, war or other acts of violence or crime or risk of such activities; insurance coverage limitations; material adverse changes ineconomic and industry conditions, including the availability of short and long-term financing; and the pandemic created by the outbreak of COVID-19 and its variants, and resulting effects on economicconditions, the demand environment for logistics requirements and energy prices, restrictions imposed by public health authorities or governments, fiscal and monetary policy responses by governments and financial institutions, and disruptions toglobal supply chains.

We caution that the foregoing list of factors is not exhaustive and is made as of the date hereof. Additional information aboutthese and other assumptions, risks and uncertainties can be found in reports and filings by CP and KCS with Canadian and U.S. securities regulators, including any proxy statement, prospectus, material change report, management information circularor registration statement to be filed in connection with the transaction. Reference should be made to “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Forward LookingStatements” in CP’s and KCS’s annual and interim reports on Form 10-K and 10-Q. Due to the interdependencies and correlation of these factors, as well asother factors, the impact of any one assumption, risk or uncertainty on FLI cannot be determined with certainty.

Except to the extent required by law, weassume no obligation to publicly update or revise any FLI, whether as a result of new information, future events or otherwise. All FLI in this news release is expressly qualified in its entirety by these cautionary statements.

ADDITIONAL INFORMATION ABOUT THE TRANSACTION AND WHERE TO FIND IT

This news release shall not constitute an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of securities in anyjurisdiction in which such offer, solicitation or sale would be unlawful prior to appropriate registration or qualification under the securities laws of such

jurisdiction. No offering of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the U.S. Securities Act of 1933, as amended. CP has filed withthe U.S. Securities and Exchange Commission (“SEC”) a registration statement on Form F-4, which includes a proxy statement of KCS that also constitutes a prospectus of CP. The registration statementhas been declared effective. CP has filed with the SEC its prospectus and KCS has filed with the SEC its definitive proxy statement in connection with the proposed transaction . CP has filed a management proxy circular in connection with thetransaction with applicable securities regulators in Canada. INVESTORS, STOCKHOLDERS AND SHAREHOLDERS OF KCS AND CP ARE URGED TO READ THE PROXY STATEMENT/PROSPECTUS AND MANAGEMENT PROXY CIRCULAR, AS APPLICABLE, AND ANY OTHER DOCUMENTS FILED OR TO BEFILED WITH THE SEC OR APPLICABLE SECURITIES REGULATORS IN CANADA IN CONNECTION WITH THE TRANSACTION WHEN THEY BECOME AVAILABLE (INCLUDING ANY AMENDMENTS AND SUPPLEMENTS THERETO), AS THEY CONTAIN AND WILL CONTAIN IMPORTANT INFORMATION ABOUT KCS, CP,THE TRANSACTION AND RELATED MATTERS. The registration statement and proxy statement/prospectus and other documents filed by CP and KCS with the SEC are available free of charge at the SEC’s website at www.sec.gov. In addition, investors andshareholders may obtain free copies of the registration statement, proxy statement/prospectus, management proxy circular and other documents which have been filed with the SEC and applicable securities regulators in Canada by CP online atinvestor.cpr.ca and www.sedar.com, upon written request delivered to CP at 7550 Ogden Dale Road S.E., Calgary, Alberta, T2C 4X9, Attention: Office of the Corporate Secretary, or by calling CP at 1-403-319-7000, and may obtain free copies of the proxy statement/prospectus and other documents filed with the SEC by KCS online at www.investors.kcsouthern.com, uponwritten request delivered to KCS at 427 West 12th Street, Kansas City, Missouri 64105, Attention: Corporate Secretary, or by calling KCS’s Corporate Secretary’s Office by telephone at 1-888-800-3690 or by email at corpsec@kcsouthern.com.

You may also readand copy any reports, statements and other information filed by KCS and CP with the SEC at the SEC public reference room at 100 F Street N.E., Room 1580, Washington, D.C. 20549. Please call the SEC at 1-800-732-0330 or visit the SEC’s website for further information on its public reference room.

ABOUT CANADIAN PACIFIC

Canadian Pacific is atranscontinental railway in Canada and the United States with direct links to major ports on the west and east coasts. CP provides North American customers a competitive rail service with access to key markets in every corner of the globe. CP isgrowing with its customers, offering a suite of freight transportation services, logistics solutions and supply chain expertise. Visit www.cpr.ca to see the rail advantages of CP. CP-IR

ABOUT KCS

Headquartered in Kansas City, Mo., Kansas CitySouthern (KCS) (NYSE: KSU) is a transportation holding company that has railroad investments in the U.S., Mexico and Panama. Its primary U.S. holding is The Kansas City Southern Railway Company, serving the central and south central U.S. Itsinternational holdings include Kansas City Southern de Mexico, S.A. de C.V., serving northeastern and central Mexico and the port cities of Lázaro Cárdenas, Tampico and Veracruz, and a 50 percent interest in Panama Canal RailwayCompany, providing ocean-to-ocean freight and passenger service along the Panama Canal. KCS’ North American rail holdings and strategic alliances with other NorthAmerican rail partners are primary components of a unique railway system, linking the commercial and industrial centers of the U.S., Mexico and Canada. More information about KCS can be found at www.kcsouthern.com.

Contacts

Kansas City Southern

Media

C. Doniele Carlson

Tel: 816-983-1372

dcarlson@kcsouthern.com

Investment Community

Ashley Thorne

Tel: 816-983-1530

athorne@kcsouthern.com