https://www.bbc.co.uk/news/uk-england-london-62575889 Tracks to the west of London bridge affects trains heading for Charing Cross and Blackfriars
Wow. I assume the SouthEastern lines up to Faversham were closed. (Don't know much about London stations so I might be wrong).
The line in question is between Charing Cross and London Bridge, so the affected trains would be any out of CHX (which go to Dartford, Gravesend, Orpington, Folkestone, Ramsgate and a few others) or via Blackfrairs (so Orpington, Rainham, Brighton) The Faversham route via HS1 comes out of St Pancras, the Faversham route (non-high speed) is from Victoria via the Chatham Mainline (so a few miles south of this incident) Fun fact though, the bridge at the bottom of the shot is the replacement of the bridge seen in the Harry Potter movies when he goes to the Leaky Cauldron...