Rail cable problem hitting trains trains on East Anglia-London line
Overhead cable problems have caused 45 minute delays on the mainline linking London with Norfolk, Suffolk and Essex.
Train operator National Express East Anglia has apologised for disruption to rail users and commuters.
Network Rail said the delays were due to overhead wire problems at Forest Gate in east London and they were working to make repairs.
A replacement bus service was operating between Shenfield and London Liverpool Street stations.