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A Transit Agency Guide to Evaluating Secondary Train Detection/Protection Systems in Communications-Based Train Control Systems (2018) / Chapter Skim
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... SECTION 2  2  Problem Statement  According to IEEE 1474.1‐2004 – IEEE Standard for CBTC Performance and Functional Requirements,  "A  CBTC  system  is  a  continuous,  automatic  train  control  system  utilizing  high‐resolution  train  location determination, independent of track circuits; continuous, high capacity, bidirectional train‐ to‐wayside data communications; and train‐borne and wayside processors capable of implementing  automatic  train  protection  (ATP)   functions,  as  well  as  optional  automatic  train  operation  (ATO)
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