The third rail of a nation's politics is a metaphor for any issue so controversial that it is "charged" and "untouchable" to the extent that any politician or public official who dares to broach the subject will invariably suffer politically. The metaphor comes from the high-voltage third rail in some electric railway systems.
Touching a third rail can result in electrocution, so usage of the metaphor in political situations relates to the risk of "political suicide" that a person would face by raising certain taboo subjects or having points of view that are either censored, shunned or considered highly controversial or offensive to advocate or even mention.
It is most commonly used in North America. Though commonly attributed to Tip O'Neill, Speaker of the United States House of Representatives from 1977 to 1987, it seems to have been coined by O'Neill aide Kirk O'Donnell in 1982 in reference to Social Security.
Examples by country Argentina The Falkland Islands sovereignty dispute
Australia Policies to address climate change Introducing Constitutional recognition of Indigenous Australians, Aboriginal and Torres Strait Islander Voice, Makarrata Commission and Indigenous treaties Removing or reforming negative gearing
Canada Reforming or privatizing public health care Reforming or privatizing the Canada Pension Plan
China Advocating for Hong Kong independence
Germany Introducing a speed limit on Autobahns
India The introduction of income tax for agricultural income
Ireland Abortion was viewed as a third rail prior to the Thirty-sixth Amendment of the Constitution of Ireland which legalised it in 2018 The provision of medical cards (which grant free or low-price healthcare to people on low incomes and the chronically ill)
New Zealand
Reforming eligibility for superannuation. Repealing or reforming the country's nuclear-free policy.
United Kingdom Drug policy Reform of the National Health Service Social care West Lothian question Rejoining the European Union
United States A wide range of issues might be claimed detrimental to politicians tackling them, but those below have all been explicitly described using the "third rail" metaphor:
Withdrawal of Social Security and Medicare benefits"Medicare: the new Third Rail of American politics?", The Washington Post Sex offender registry Debate of race issuesStill a House Divided: Race and Politics in Obama's America, Desmond S. King, Rogers M. Smith, Reprint edition December 8, 2013, Princeton University Press, books.google.com: "Sociologist John David Skrentny exaggerates only slightly when he says that at this point, advocacy of racial preferences was a 'third rail' in American politics: 'touch it and you die.'"Daring to Touch the Third Rail, Robert Koehler, Newsweek, 01/19/08, "Obama has avoided being pigeonholed as the "black candidate" and has mostly steered clear of talking about race on the campaign trail (at least until his recent fracas with Hillary Clinton over whether she besmirched King's legacy by noting President Lyndon Johnson's role in the Civil Rights Act). But Michelle hasn't backed away from discussing her experiences of race and prejudice."Short-Circuiting the New Third Rail in Politics, July 20, 2012, Suzanne Fields, RealClearPolitics, "Race has become the third rail of American politics. Touch it, and you die. It's the rail some of our angriest Democrats want to ride Mitt Romney and the Republicans out of town on." Antidumping and countervailing duty withdrawal Opposition to abortion for rape victims Resuming the draft Debate about U.S. support for Israel Guns, including semi-automatic weapons and child safety locks. The transfer of federal lands over to states
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