Kolkata: Services on Metro's North-South line were disrupted for 21 minutes in the evening due to a signal point issue at Dakshineswar. "At 5.01 pm, as the train was entering the down line from the up line at Dakshineswar station, it stopped due to a point failure. Services resumed at 5.22 pm," a Metro spokesperson said. Truncated services were run between Noapara and Kavi Subhas. tnn