Five Grades of Automation.

The summary automation of rail transport into five Grades of Automation.

Grade of Automation	Type of Train operation	Setting train in motion	Stopping train	Door closure	Operation in event of Disruption
GoA 0	On-Sight Train Operation	Driver	Driver	Driver	Driver
GoA 1	ATP with driver	Driver	Driver	Driver	Driver
GoA 2 - STO	Semi-automatic Train Operation (ATP and ATO with driver)	Automatic	Automatic	Driver	Driver
GoA 3 - DTO	Driverless Train Operation	Automatic	Automatic	Train attendant	Train attendant
GoA 4 - UTO	Unattended Train Operation	Automatic	Automatic	Automatic	Automatic