Services on Central Railways were severely hit on Thursday morning when a suburban train dragged down an overhead cable.
It took about eight hours to restore train services. Twenty trains had to be cancelled during the morning peak hours.
Railway officials said that an insulator holding the wires had given way and had led to the incident.
“A kilometre of overhead fitments that were damaged had to be replaced, including the contact wire and droppers. The damage was so extensive that the exercise was like laying new wires,” said S.C. Mudgerikar, chief spokesperson, Central Railways.
The stranded train had to be towed away by a diesel engine so that repair work could be done.
More than 100 electrical engineering staff and senior railway officials were engaged in repairs.