Inaugurated on October 4, 2019, Grey Line or Line 9 is the newest line of Delhi Metro. At just three stations and 4.2 km, it is also the shortest line on the system. With its inauguration, most of Delhi Metro Phase III has been completed. The line, just like others in Phase II and Phase III, uses standard gauge (1435 mm) tracks and overhead wires carrying alternating current at 25 kilovolts. All the stations on the line have platform screen doors.
Stations on Grey Line
| Station | Interchange | |
| Najafgarh | नजफगढ़ | |
| Nangli | नगली | |
| Dwarka | द्वारका | Blue Line |
Grey Line Route Map
Further Extension of Grey Line
Grey Line is being extended to Dhansa Bus Stand, which will add one station to it.
Other Delhi Metro Lines: Red | Yellow | Blue | Green | Violet | Orange | Magenta | Pink | Rapid Metro
