Original: The line is equipped with an Automatic Train Operation system (ATO); the train operator (driver) closes the train doors and presses a pair of "start" buttons, and if the way ahead is clear, the ATO drives the train at a safe speed to the next station and stops there.
Simplified: The line is equipped with an Automatic Train Operation system (ATO). The train operator (driver) closes the train doors and presses a pair of "start" buttons. If the way ahead is clear, the ATO drives the train at a safe speed to the next station and stops there.