ATC (Automatic Train Control)
ATO
ATP
ATS
Automatic Train Protection
Automatic Train Supervision
Automatic Train Operation
Detection
Detect presence of train
Transmit data
Wayside equipment
Train on track circuits
Track train headway/arrival
Indication of stopping position
Operation of start & stop
Safety system
Safe spacing between trains
Provide sufficient warning for train stoppage
Generate timetables for train schedules
Obtain train position
Obtain speed information from ATP
Obtain train arrivals information from ATO
Obtain train depatures infromation from ATO
Issue routing commands automatically
Facilitate remote central control of train service
Train service data and events such as faults , alarms , train delays