Delhi Metro Railway Corporation had made its foray into Haryana five years ago and with this project, the DMRC will further spread its operations in the neighbouring state.
DMRC MD Mangu Singh was also present during the flagging off of the first trial run.
"The first trial train on this section today traveled from the Badarpur station to Old Faridabad Metro station," a statement said.
A metro spokesman said during trial runs, the interaction of the trains with civil structure would be checked to ensure that there is no physical blockage during its movement on the tracks.
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The corridor is an extension of the existing Mandi House -Badarpur line (Line 6) of the network. According to official estimates, presently the average ridership on it (Line 6) stands at around 1.92 lakh per day.
Once fully operational, Line 6 will span from Kashmere Gate to Escorts Mujesar having a length of 43.4 km, with a total of 32 stations including five interchange stations, namely Kashmere Gate, Mandi House, Central Secretariat, Lajpat Nagar and Kalkaji Mandir.
The depot for the section, which has been named Arjonda Depot, has been constructed near Sector 20 A in the city.
Officials said that two more stations, NCB Colony and Ballabgarh, would be added in the line by 2017 thus increasing the length of the line by another 3.2 km.
After trial runs, DMRC will have to get the mandatory Commissioner for Metro Rail Safety (CMRS) clearance, after inspecting the line for all safety parameters for passengers.