Thousands of Delhi Metro commuters were hit Thursday as a technical glitch hit the blue line, forcing trains to run at a restricted speed.
Large crowds piled up at platforms all along the busy route that links Dwarka in west Delhi with Noida and Vaishali in Uttar Pradesh.
A Delhi Metro official said, "There was a technical glitch in the track circuit system at Rajouri Garden around 10.40 am because of which there was a delay. The problem has been sorted out.
"There was a delay in (running of trains) for about 15 minutes," the official added.
The 49-km long blue line is the longest Delhi Metro network.