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  2. Public address system - Wikipedia

    en.wikipedia.org/wiki/Public_address_system

    Some PA systems have speakers that cover more than one building, extending to an entire campus of a college, office or industrial site, or an entire outdoor complex (e.g., an athletic stadium). A large PA system may also be used as an alert system during an emergency. PA systems by size and subwoofer approach

  3. Vehicle registration plates of Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/Vehicle_registration...

    Pennsylvania adopted the current system to combat criminals making counterfeit "T" stickers. For plates that already had the "T" stickers but were not issued yet to vehicles at the time of the change, Pennsylvania gave car dealerships and notaries plain white stickers to cover up the "T" tags so that the plates could still be used. [citation ...

  4. R4 (New York City Subway car) - Wikipedia

    en.wikipedia.org/wiki/R4_(New_York_City_Subway_car)

    This car was one of the two cars that were outfitted with "bullseye" lighting and an experimental PA system. Car 800 has been preserved by the Seashore Trolley Museum in Kennebunkport, Maine. The car is modified with trolley poles and used in various trips at their museum, often coupled to R7 car 1440.

  5. List of streetcar systems in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_streetcar_systems...

    A diamond (♦) symbol denotes a system that operates or operated in the same area as another independent system. Names and cities of currently operating systems appear in bold on blue backgrounds. Interurban and light rail systems are denoted in the Type column, which is left blank for the far-more-plentiful streetcar systems. (Some pre-1970s ...

  6. Pittsburgh Light Rail - Wikipedia

    en.wikipedia.org/wiki/Pittsburgh_Light_Rail

    The Pittsburgh Light Rail (commonly known as The T) is a 26.2-mile (42.2 km) light rail system in Pittsburgh, Pennsylvania, and surrounding suburbs.It operates as a deep-level subway in Downtown Pittsburgh, but runs mostly at-grade in the suburbs south of the city.

  7. Pennsylvania State Police - Wikipedia

    en.wikipedia.org/wiki/Pennsylvania_State_Police

    The coat has four gold-colored buttons, breast and hip pockets, and shoulder epaulets for the placement of the officer's current rank. A white shirt is worn with a black tie underneath. A system of "rank rings" are worn on each sleeve, similar to the rank-ring system used by the U.S. Navy, U.S. Coast Guard, and by land units of the Canadian ...