Curiosity about the extension

Ah right, that makes sense. Although they could've built new platforms and tunnels facing the extension route. Or would the fact that both the Bakerloo and Northern go to Waterloo from Charing Cross been a deciding factor on that?

Understandable, thanks for answering guys!

Is it possible to extend the Jubilee from Charing Cross and have a new branch?

Say Charing Cross > Blackfriars Temple > St Paul's > Moorgate > Farringdon > KXSP > Euston ?

EDIT: Blackfriars substituted for temple due to real distance.

Plus it will be completely impractical, as it will leave the most crowded part of Jubilee on a branch.

The 'original' Fleet (Jubilee) plan was, after Stage 1 to Charing Cross, Stage 2 via Aldwych & Cannon Street to Fenchurch Street, then Stage 3 turning South East to Lewisham, and a take over of the BR 'Mid-Kent' line to Hayes and Addiscombe.

Then when Docklands development came into the picture the River Line proposals emerged - essentially east from Fenchurch St through Docklands towards Thamesmead.

But neither Fleet/Jubilee 2 & 3, or River line was felt affordable at that time (1970s/80s): the DLR emerged in place of the River Line, as appropriate (and affordable) for the then (low density) Docklands regeneration proposals.

Then came Olympia and York's Canary Wharf Development - for which they said 'we want a tube link to Waterloo', and were prepared to contribute to it - and it is essentially that 'Waterloo and Docklands' proposition (with their contribution - which sounded big but AIUI ended up being a comparatively small contribution) which became the JLE as built.

Perhaps this diagram hanging on my wall may help answer the question in the OP:


JLE Charing Cross to Waterloo by rincewindthefailedwizard, on Flickr

I suspect "COVENT GARDEN" got in the way, the diagram is after all, 'NTS'.

So anyone waiting on the platform at Aldwych would have heard the tunneling