•  Fixed signalling blocks
  • Control logic dispersed along the routes
  • Low integration of its individual parts
  • Disparate technical solutions even within one single line
  • DIVISION OF THE INTERLOCKING SYSTEMS
  • Station interlocking system
  • Track interlocking system
  • Level crossing interlocking system
  • speed limit due to the number of unprotected crossings
  • Low usability of these facilities for other purposes
  • Too much dependence on the human factor
  • High cost of implementation
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