"Don't the change the electricity supply from overhead to the 3rd rail somewhere around that area? Maybe that slows them up a bit to do the changeover"
That occurs at Farringdon. London Bridge's problem is travelling across from Platform 4 at Blackfriars across all the lines from Kent into Blackfriars and then cross over all the lines that go From Charing Cross to Kent
Dave
[This message has been edited by Dave Noble (edited 03-15-2003).]