Signal issues affects Delhi metro blue line

Train services were affected for nearly one and a half hour on the Delhi Metro's Blue Line Wednesday afternoon due to signalling issues on the Karol Bagh-Dwarka section, officials said.

The Blue Line connects Dwarka to Noida/Vaishali.

"Train services were affected due to signalling issue (loss of centralised view intermittently) on the Karol Bagh-Dwarka section," a senior official said.

The snag led to bunching of trains, the official said.

"The view and control of the signalling and Automatic Train Control system on Blue Line (Dwarka Sec-21 to Noida City Centre/Vaishali) at Operations Control Centre (OCC) were intermittently getting lost today between Karol Bagh and Dwarka section," the official said.

As a result, trains were being locally controlled as and when such view loss was happening, resulting in "intermittent bunching/hold up of trains for brief spells".

"Between 3:00 to 3:30 pm, the loss of view was for the entire Blue Line, which created bunching on the overall line, before being restored again at 3:30 pm. The intermittent issue was resolved at 4:23 pm and since then train services are running normally on entire Blue Line," he said.