My older readers may remember the time when Blackfriars Station was the last station before Holborn (High Level). There had been an intermediate station at St Paul's. As the train pulled into Holborn there could be seen, on the left, a cutting down which had run a line to Holborn (Low level) and thence to Farringdon. Fast forward a few years: Holborn (High Level) is no more and Thameslink trains now run down the cutting to City Thameslink (the replacement for Holborn (Low Level)) and thence to Farringdon.
Blackfriars Station has been rebuilt and it is now possible to access the south bank of the River Thames close to the Turner Contemporary. Saves a walk from London Bridge or Waterloo East.