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A train protection system is a railway technical installation to ensure safe operation in the event of human failure. Contents 1 Development 1.1 Train stops 1.2 Inductive systems 1.3 Radio-based 1.4 Cab signalling 2 Variants 2.1 International standards 2.2 Country-specific systems 3 See also 4 Bibliography 4.1 References Development Berlin S-Bahn train stop in its engaged (left) and disengaged (right) position Train stops Main article: Train stop The earliest systems were train stops, as still used by the New York City Subway, the Toronto subway, the London Underground, the Moscow Subway (only on the older lines) and the Berlin S-Bahn. Beside every signal is a moveable arm. If the signal is red, levers connected to valves on any passing train hit the arm, opening the brake line, applying the emergency brake, If the signal shows green, the arm is turned away from the levers and there is no contact. [1] The Gr...

This article is about the eve of the feast day of St Walpurga. For George Balanchine's 1975 ballet, see Walpurgisnacht Ballet. Saint Walpurgis Night Saint Walpurga's Eve Walpurgisnacht at the open-air theatre in Heidelberg Also called Valpurinyö Walpurgis Night Saint Walburga's Night Saint Walburga's Eve Saint Walpurgis' Eve Saint Walpurga's Day Saint Walburga's Day Saint Walburgis' Day Feast of Saint Walpurga Feast of Saint Walburga Saint Walburgis' Day Observed by Roman Catholic Church Lutheran Churches Anglican Communion Type Christian, cultural Celebrations Bonfires, dancing [1] Observances Mass and Service of Worship; pilgrimage to the Church of Saint Walpurgis in Eichstätt [2] Date 30 April - 1 May Frequency Annual Related to May Day, Easter Luis Ricardo Falero: Walpurgis Night 1878 Walpurgis Night , an abbreviation of Saint Walpurgis Night (from the German Sankt Walpurgisna...

Maureen Dowd Dowd at a Democratic Debate in Philadelphia, Pennsylvania, in April 2008 Born Maureen Brigid Dowd ( 1952-01-14 ) January 14, 1952 (age 66) Washington, D.C., U.S. Education Immaculata High School Alma mater Catholic University of America (B.A.) Occupation Columnist Notable credit(s) Washington Star Time The New York Times (1983–present) Maureen Brigid Dowd [1] ( / d aʊ d / ; born January 14, 1952) is an American columnist for The New York Times , and an author. During the 1970s and the early 1980s, Dowd worked for Time magazine and the Washington Star , where she covered news and sports and wrote feature articles. Dowd joined The New York Times in 1983 as a Metropolitan Reporter, and became an op-ed writer for the newspaper in 1995. In 1999, Dowd was awarded a Pulitzer Prize for her series of columns on the Monica Lewinsky scandal in the Clinton administration. Contents 1 Early life and career 2 New York Times column...