The incident occurred in the wee hours of Tuesday morning. No injures have been reported.
Following the mishap, slow trains were diverted to the fast track from Mumbai Central to Dadar.
"Slow local lines are affected. Fast lines working only. Restoration work is in full swing," Western Railway tweeted.
"Slow trains are being diverted on fast lines for Churchgate from Mahim as fast lines are fully operational. Extra buses have been deployed by BEST between Mahim-CCG for commuters in affected sec besides services on fast lines," Western Railway tweeted.