NETWORK Rail has written to Transport for London seeking urgent answers after thousands of train passengers in East Anglia suffered severe disruption earlier in the week.

NETWORK Rail has written to Transport for London seeking urgent answers after thousands of train passengers in East Anglia suffered severe disruption earlier in the week.

On Wednesday evening a concrete slab from a Transport for London (TfL) bridge came crashing down on the tracks at Liverpool Street station throwing rail services into chaos.

Services were stopped and it was not until 9.30am yesterdaymorning that TfL gave the all-clear and services were allowed to restart and eventually return to normal.

Because of concerns over TfL's handling and management of both the project and contractors, Network Rail has banned work on the bridge. This will remain in place until TfL has completed an investigation and reported back on the causes of the incident.

Network Rail's Robin Gisby said: “Passengers deserve an apology for the disruption they suffered and I want assurances that such an incident can't happen again.”