10 Facts About Delhi Metro

1. Delhi Metro uses cab signalling along with a centralised automatic train control system consisting of automatic operation, protection and signalling modules.

2. When Delhi Metro services were introduced in 2002, the average ridership was 80,000 passengers per day.

3. Security on the Delhi Metro is handled by the Central Industrial Security Force, who have been guarding the system ever since they took over from the Delhi Police in 2007.

4. The Delhi Metro has a sophisticated fire alarm system for advance warning in emergencies, and fire retardant material is used in trains as well as on the premises of stations.

5. Delhi Metro was planned to be built in phases spread over around 20 years as with each phase having a target of five years and end of one phase marking the beginning of another.

6. The line was operated by Delhi Airport Delhi Metro Express Pvt.

7. The Delhi Metro became the second underground rapid transit system in India, after the Kolkata Metro, when the Vishwa Vidyalaya–Kashmere Gate section of the Yellow Line opened on 20 December 2004.

8. Physical construction work on the Delhi Metro started on 1 October 1998.

9. Delhi Metro is the largest and busiest metro in India by a considerable margin, and the world's 9th longest metro system in length and 16th largest in ridership.

10. Delhi Metro is a metro system serving Delhi and its satellite cities of Faridabad, Gurgaon, Bahadurgarh, Noida and Ghaziabad in the National Capital Region of India.