Prime Minister Narendra Modi inaugurated the new Chennai Metro stretch.
The stretch connects Poonamallee and Vadapalani, covering roughly 15 km.
Eleven elevated stations were built along the route.
A 3.7 km double‑deck section allows two trains to travel side by side.
Advanced signalling enables driverless operation of the trains.
Regular passenger service began at 4 pm on Sunday, with extended hours from October 12.
The new line runs from Poonamallee to Vadapalani and includes eleven stations.
A special 3.7‑kilometre section has two levels of tracks, called a double‑deck.
Modern signalling lets the trains run without a driver.
The service started on Sunday at 4 pm and will later run from 7 am to 9 pm each day.
The project cost about 4,900 crore Indian rupees, a very large amount of money.
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