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Abbreviations;
DACS: Data Collecting & Switching system
FOCS: Freight Operation Control System
EPOCS: Effectual Planning and Operation of Container System
MARS: Magnetic & electronic Automatic Reservation System
YACS: Yard Automatic Control System
RC: Remote Control
CTC: Centralized Traffic Control system
COMTRAC: Computer-aided Traffic Control System
ATS: Automatic Train Stop system
ATC: Automatic Train Control system
ATO: Automatic Train Operation system
Fig. 2 Expansion of railway signals I telecommunications
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