On Jan 8, 6:04*pm, Stephen Furley wrote:

What's the new siding being used for? *Is this something to do with
the re-building of Blackfriers station?

It's a product of the Thameslink Programme - trains that currently use
the soon to close Moorgate branch will be diverted through
Blackfriars, and a few of these will reverse in said siding (in
addition to and/or in place of those that already do).