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Automatic train operation is an operational safety enhancement device used to help automate the operation of trains. The degree of automation is indicated by the Grade of Automation , up to GoA level 4. ATO is primarily used on automated guideway transit and rapid transit systems where it is easier to ensure the safety of people. On most systems, there is a driver present to mitigate risks associated with failures or emergencies.
Many modern systems are linked with automatic train control and, in many cases, automatic train protection where normal signaller operations such as route setting and train regulation are carried out by the system. The ATO and ATC/ATP systems will work together to maintain a train within a defined tolerance of its timetable. The combined system will marginally adjust operating parameters such as the ratio of power to coast when moving and station dwell time in order to adhere to a defined timetable.