On 2 Apr, 10:42, Jamie Thompson wrote:
...firstly, yes, which is why demolition was required.

Not cutting exactly. The northernmost pair are in actual tunnel (or
"covered way" at least) west of Brick Lane.

...secondly, yes, but for a few hundred metres or so they are both
heading north until the eastern line turn east, easily enough for the
throat required for the new platforms.

Only if you demolish an enormous swathe of Shoreditch. And if you're
planning to 8 track the line west of Bethnal Green junction (which you
probably need to do to have enough trains to need more platforms),
there's an enormous amount of digging to do as well.

Hence my suggestion of re-using the Bishopsgate Goods Yard viaduct
route, which starts at roughly Bethnal Green, and would require far
less demolition. You could even have used the original GE19 bridge,
and maybe the Braithwaite viaduct, and Broad Street station itself.

U