Where did you get your routes from? Some of them aren't quite right.

For instance, on the W &C, you 'chose to cross the Thames at Southwark
Bridge as this is close to where the Waterloo & City line crosses the
river'.

However, the W&C doesn't really go this way (despite it's portrayal on the
diagrammatic map as such). It cross the river soon after leaving Waterloo,
and passes close to Blackfriars station on the North side of the river.

BTN

Hi,

The routes were mostly just made up on the spot. I was more going
between the stations rather than trying to follow the actual route of
the line. This allowed me to take more interesting detours than just
following the line would allow. In the W&C case I guess the crossing
point was more influenced by the position of the crossing on the
diagrammatic tube map, and also because I wanted to walk along the
South Bank! I've updated my post to reflect this.

Cheers,
londonphotoproject