The Blue Line operates from Dwarka to Noida City Centre/Vaishali terminals.
"Due to the snapping of a strand of the overhead electrical wire between Dwarka and Dwarka Morh station, single line operation is on between Dwarka and Janakpuri west while a short loop is running between Janakpuri west and Rajiv Chowk," said an official of the Delhi Metro Rail Corporation (DMRC).
It said normalcy will be restored as soon as the wire is repaired.
According to many stuck commuters, the trains were stopping at each station for close to 20 minutes and many passengers got off and took autos and taxis.
"I took the metro from Noida sector 18 and after one and a half hours I have only managed to reach Rajiv Chowk. I am getting off and taking an auto," said Rupali Singh, a 24-year-old professional.