On Wed, 7 Mar 2007 12:20:15 -0000, John Rowland wrote:

I'm not aware of any plans to change the changeover point.

I believe the latest plan is to move the changeover to City
Thameslink. (originally it was Blackfriars)..

Whats the point?

The point is that if the panto gets stuck up or down, the train can't
proceed and will need to escape into the City Thameslink sidings rather than
get in the way of the other trains. Merely sending the train back might not
be an option when the other line is already carrying 24tph which have to fit
punctually between other services in South London.

We're talking about an occasional failure here. It's not going to have
to fit into the normal timetable.

I am not sure
why Blackfriars was ever considered as the changeover point, especially
since catenary would increase the visual intrusion of the bridge over the
Thames.

Perhaps because trains don't normally stop at City Thameslink on
Sundays, Saturday evenings, and during the night. If the changeover is
there, they'll all have to stop there all the time.