The glitch, which was reported around 5.40 pm, slowed down train operations till about 7 pm, before it was rectified, giving a tough time to evening peak hour commuters on the line that connects Noida to south west Delhi's Dwarka.
"Train services on Line-3 were briefly affected from 6 pm to 7 pm between Janakpuri West to Dwarka section of Line-3 to undertake immediate repair of an OHE wire which was broken as a bird dropped a metallic wire on it, following which it snapped," a metro spokesperson said.
Single line services were continued through down line (towards Noida) on this section to work as a shuttle service, which kept the entire line running, but it could not prevent bunching of trains along the 50-km-long corridor.
The Blue Line is extremely snag-prone due to a host of factors including its vulnerability to external factors as it is largely overground.
Services were fully restored around 7 pm, the spokesperson added.