The Dwarka-Najafgarh corridor, known as the Grey Line, of the Delhi Metro’s Phase-3 is ready to open soon as trial run on this route started last month. "During the trial runs, the interaction of the metro train with physical infringements (civil structure) were checked to ensure that there is no physical blockage during the movement of the train on the track," the DMRC said.

The Delhi Metro Rail Corporation (DMRC) is now awaiting inspection by the Commissioner for Metro Rail Safety (CMRS) on the 4.2 km-long Dwarka-Najafgarh corridor. "Commissioner of Metro Rail Safety (CMRS) Janak Kumar Garg will inspect the 4.295-km Dwarka-Najafgarh section of Delhi Metro on Wednesday," PTI quoted a senior DMRC official as saying.

Here is all you need to know about Delhi Metro Grey Line

1) Delhi Metro grey line section consists of three stations - Dwarka (interchange with Blue Line), Nangli and Najafgarh.

2) Of the three stations in Dwarka-Najafgarh corridor, Dwarka and Nangli are elevated ones, while Najafgarh station is underground.

3) The Grey Line will be connected with the Blue Line, which connects Dwarka Sector-21 to Noida Electronic City and Ghaziabad’s Vaishali in Uttar Pradesh.

4)According to a report in Hindustan Times, official DMRC estimates show that nearly two lakh commuters are likely to benefit from the new section.

5) The Dwarka-Najafgarh corridor will be further extended by another 1.18 km till Dhansa Stand, by 2020.

The Delhi Metro's total operational network at present stands at over 343 km, with multiple corridors and 250 stations having its footprints in various cities neighbouring Delhi. An average of about 28 lakh commuters use the Delhi Metro every day.