"Due to technical problem between Karol Bagh and R K Ashram stations, train services are being run in 3 loops on Line 3," a DMRC official said.
Trains between Karol Bagh to Dwarka-21 and Barakhamba to Noida/Vaishali are being run on short loop while trains between Karol Bagh and Barakhamba stations are run on single line since 12:40 pm.
"It is not known by when the problem will be sorted, he said, adding hundreds of passengers were delayed due to the problem.