"Nine trains were in the tunnel, and were immediately brought to the nearest station and the passengers were evacuated and refunded the amount. No passengers are stranded in the tunnel," the Metro official added.
Services on all six lines of Delhi Metro were disrupted due to tripping of power supply in the northern power grid for the second day Tuesday.
"Due to northern grid failure, all train services have been suspended and entry to all stations stopped. The trains, which are plying right now, are being brought to the nearest station for evacuation," a Delhi Metro official said.
Image: Commuters wait for buses outside a Metro station after Delhi Metro rail services were disrupted following power outage in New Delhi, Tuesday, July 31, 2012.