After the inauguration, Modi will also address a public gathering at Noida's Amity University.?
Prime Minister Narendra Modi will inaugurate the Delhi Metro's Magenta Line today.
The new 12.64-km route -- from Delhi's Kalkaji Mandir to Noida's Botanical Garden -- is expected to cut travel time from south Delhi to Noida by as much as 40 minutes.
Uttar Pradesh Chief Minister Yogi Adityanath will be present at the inauguration.
Delhi Chief Minister Arvind Kejriwal however has not been invited.
Delhi's AAP government is currently locked in a bitter battle with the Centre over recent Delhi Metro fare hikes.
The Magenta Line will feature the country's first driverless metro trains.
One of the trains on the new line had had an accident recently.
Delhi Metro had later said the fault had not been with the train and that the accident had been caused by human error.
It said the driver parking the metro train had forgotten to engage the brake, which caused it to roll back and crash through a wall of the Kalindi Kunj depot.
Delhi Metro has also said that while the metro trains will be "driverless", a human operator will be present in the driver's cab for the first two to three years of operations.
Adityanath had arrived in Noida Saturday to oversee preparations for the inauguration -- Noida residents said the town looked spruced up -- breaking the "Noida jinx" in the process.
The jinx is believed to cause Uttar Pradesh chief ministers who visit the city to lose the following elections.
After the inauguration, Modi will also address a public gathering at Noida's Amity University.
Delhi's first metro line had also been inaugurated on Christmas day 15 years ago in 2002 by then prime minister Atal Bihari Vajpayee.