- 6 updates
Network Rail and Thameslink bosses face the London Assembly's Transport Committee later.
Rail executives will be questioned over recent overcrowding and chaos at London Bridge station.
Commuters faced weeks of disruption because of reconstruction work at the station.
The Department for Transport has said it is 'urgently speaking' to Network Rail after major delays at London Bridge station today. Earlier this morning a broken down freight train blocked a line into the station, causing delays for the entire day. Now the Government has said is it 'extremely frustrating' that thousands of commuters face disruption. Last week, images of people jumping over the barriers were posted online after commuters were left stranded.
A Department for Transport spokesman said:
Images have emerged on social networking sites showing police at London Bridge station, following another day of disruption. Last week, officers had to be called to control the crowds of disgruntled commuters at the station.
Network Rail has apologised for more delays at London Bridge today. Disruption is expected to continue until 5pm after a freight train broke down this morning.
A Network Rail spokesman said:
Thameslink services to London Bridge are terminating at East Croydon and Gatwick Airport, while Southern is running an amended timetable until the wagon is moved. Southeastern services are not affected.
Today's disruption at London Bridge is expected to last until at least 5pm and follows last Tuesday night's problems, when police had to be called in to help manage thousands of stranded passengers.
Train passengers using London Bridge station are facing more travel misery following chaotic scenes last week. The latest problem, affecting those travelling on Southern and Thameslink services, has been caused by a broken-down freight train.
Services in and out of London Bridge are already affected by long-running engineering work, with today's difficulties meaning Thameslink trains were unable to use the station.