The then Prime Minister Atal Bihari Vajpayee had inaugurated the first stretch on the Red Line.
The Shahdara to Tis Hazari stretch covered six stations.
Services were open for passengers on Christmas.
Today, the network is spread over 393 km with 288 stations.
As per DMRC, another 65 km of new lines are coming up soon.
Six million passengers commute via the Delhi metro daily.
It is one of the world's largest mass transit systems.
2023 has been a "year of achievements” for the urban transporter, DMRC said.
New digital ticketing solutions have made travel seamless.
The Airport Express line has become India’s fastest metro corridor.