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railway communications system

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  • Communications-based train control — CBTC deployment in Metro de Madrid, Spain …   Wikipedia

  • Railway signalling — Not to be confused with Railway signal. A gantry of British semaphore signals seen from the cab of a steam locomotive Railway signalling is a system used to control railway traffic safely, essentially to prevent trains from colliding. Being… …   Wikipedia

  • Railway signal — Not to be confused with Railway signalling. A signal is a mechanical or electrical device erected beside a railway line to pass information relating to the state of the line ahead to train/engine drivers. The driver interprets the signal s… …   Wikipedia

  • Communications Workers of America v. Beck — Supreme Court of the United States Argued January 11, 1988 …   Wikipedia

  • Communications in Argentina — gives an overview of the postal, telephone, Internet, radio, television, and newspaper services available in Argentina. Contents 1 Postal 2 Telephone 2.1 Companies 3 Internet …   Wikipedia

  • Communications and Information System — is a communication system used by surface vehicles by the Toronto Transit Commission. The system consists of a box with a phone and key pad next to the driver of the TTC vehicle. A transmitter is located on the top of the vehicle, near the rear… …   Wikipedia

  • Communications in Afghanistan — has dramatically increased since 2002, and has embarked on wireless companies, internet, radio stations and television channels. Afghan telecommunication companies, such as Afghan Wireless and Roshan, have been boasting rapid increase in cellular …   Wikipedia

  • Communications in the Isle of Man — The Isle of Man benefits from an extremely modern and extensive communications infrastructure, which underpins the main sectors of the Island s economy. Contents 1 Telecommunications 1.1 Telegraph 1.2 Telephones 1.2.1 …   Wikipedia

  • Communications on the Isle of Man — The Isle of Man benefits from an extremely modern and extensive communications infrastructure, which underpins the main sectors of the Island s economy.TelecommunicationsTelegraphThe history of Manx telecommunications starts in 1859, when the… …   Wikipedia

  • Communications Act of 1934 — The Communications Act of 1934 is a United States federal law, enacted as Public Law Number 416, Act of June 19, 1934, ch. 652, 48 Stat. 1064, by the 73rd Congress, signed by President Franklin D. Roosevelt, codified as Chapter 5 of Title 47 of… …   Wikipedia

  • Communications in Mali — Mali, a large, landlocked, multicultural country in West Africa, consistently ranks low in the Human Development Index. The infrastructure of Communications in Mali, while underdeveloped, is crucial to the nation. HistoryPrior to the 19th century …   Wikipedia

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