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  2. History of the New York City Subway - Wikipedia

    en.wikipedia.org/wiki/History_of_the_New_York...

    In April 1986, the New York City Transit Authority began to study the possibility of eliminating sections of 11 subway lines because of low ridership. The segments are primarily located in low-income neighborhoods of the Bronx, Brooklyn and Queens, with a total of 79 stations, and 45 miles of track, for a total of 6.5 percent of the system.

  3. Operating system - Wikipedia

    en.wikipedia.org/wiki/Operating_system

    The operating system provides an interface between an application program and the computer hardware, so that an application program can interact with the hardware only by obeying rules and procedures programmed into the operating system. The operating system is also a set of services which simplify development and execution of application programs.

  4. List of New York City Subway R-type contracts - Wikipedia

    en.wikipedia.org/wiki/List_of_New_York_City...

    In service: R54: Supply cars: Never purchased: R55: Passenger cars: Never purchased, but rebranded as R68 & R68A R56 Two-car rail welding unit W301–W302 Maxson Corp 1981 In service: R57 Self-propelled crane car R58 Flat cars (for refuse) RF01–RF27 Fuji Heavy Industries 1983 In service: R59 Track geometry car TGC1 Plasser: 1984 In service ...

  5. Human digestive system - Wikipedia

    en.wikipedia.org/wiki/Human_digestive_system

    He thought that the digestive system aided the respiratory system. [53] Andreas Vesalius provided some early anatomical drawings of the abdominal organs in the 16th century. In the middle of the 17th century, a Flemish physician Jan Baptist van Helmont offered the first chemical account of digestion which was later described as being very close ...

  6. Civil Service Retirement System - Wikipedia

    en.wikipedia.org/.../Civil_Service_Retirement_System

    Employees hired after 1983 are required to be covered by the Federal Employees Retirement System (FERS), which is a three tiered retirement system with a smaller defined benefit (pension), Social Security, and a 401(k)-style system called the Thrift Savings Plan (TSP). The defined benefits of both the CSRS and the FERS systems are paid out of ...

  7. Self-service - Wikipedia

    en.wikipedia.org/wiki/Self-service

    Self-service is the practice of serving oneself, usually when purchasing items. Common examples include many gas stations, where the customer pumps their own gas rather than have an attendant do it (full service is required by law in New Jersey, urban parts of Oregon, most of Mexico, and Richmond, British Columbia, but is the exception rather than the rule elsewhere [6]).

  8. R211 (New York City Subway car) - Wikipedia

    en.wikipedia.org/wiki/R211_(New_York_City_Subway...

    The R211 is a class of New Technology Train (NTT) subway cars built for the New York City Subway.Being built by Kawasaki Railcar Manufacturing for the B Division and the Staten Island Railway (SIR), they will replace two aging subway car models: all R44 cars on the Staten Island Railway and all R46 subway cars.

  9. Early history of the IRT subway - Wikipedia

    en.wikipedia.org/wiki/Early_history_of_the_IRT...

    The Dual Contracts, signed in 1913, provided for the expansion of the subway system; as part of the Dual Contracts, a new H-shaped system was placed in service in 1918, splitting the original line into several segments. Most of the original IRT continues to operate as part of the New York City Subway, but several stations have been closed.