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Positive train control (PTC) is a system of functional requirements for monitoring and controlling train movements as an attempt to provide increased safety. The American Railway Engineering and Maintenance-of-Way Association (AREMA) describes Positive Train Control as having these primary characteristics: * Train separation or collision avoidance * Line speed enforcement * Temporary speed restrictions * Rail worker wayside safety 〔American Railway Engineering and Maintenance-of-Way Association (AREMA), Lanham, MD (2009). ("Meeting the Communication Challenges for Positive Train Control." ) AREMA 2009 Annual Conference & Exposition, Chicago, IL.〕 ==Overview== The main concept in PTC (as defined for North American freight railroads) is that the train receives information about its location and where it is allowed to safely travel, also known as movement authorities. Equipment on board the train then enforces this, preventing unsafe movement. PTC systems may work in either dark territory or signaled territory, and may use GPS navigation to track train movements. The Federal Railroad Administration (FRA) has listed among its goals, "To deploy the Nationwide Differential Global Positioning System (NDGPS) as a nationwide, uniform, and continuous positioning system, suitable for train control."〔Federal Railroad Administration (FRA), Washington, DC (2002). ("Railroad Research and Development Program: Train Control." ) ''Five-Year Strategic Plan for Railroad Research, Development, and Demonstrations.'' Document no. FRA/RDV-02/02. p. 4-47.〕 Various other benefits are sometimes associated with PTC such as increased fuel efficiency or locomotive diagnostics; these are benefits that can be achieved by having a wireless data system to transmit the information, whether it be for PTC or other applications. In the 1990s, Union Pacific Railroad (UP) had a partnership project with General Electric to implement a similar system known as "Precision Train Control." This system would have involved moving block operation, which adjusts a "safe zone" around a train based on its speed and location. The similar abbreviations have sometimes caused confusion over the definition of the technology. GE later abandoned the Precision Train Control platform.〔Lindsey, Ron (2010-12-07). ("Really! You Gotta Let It Go." ) ''Strategic Railroading.''〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Positive train control」の詳細全文を読む スポンサード リンク
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