In uk.railway Basil Jet wrote:
I'm not sure exactly what the difference is, except for the pretty roof.
But imagine that the east half of Victoria was tarted up, and they
decided to build a flyover so the Brighton lines could use it. Then
twenty years later the west half is tarted up to be nicer than the east
half, so they demolish the flyover. Then twenty years later they tart up
the east side again and rebuild the flyover. Even Michael Bell wouldn't
dream of advocating such a thing.

Losing the flyover would enable reinstatement of an 8th track through
Queenstown Road (where it goes from 8 down to 7 to accommodate it, then 8
once the flyover has merged). I don't know enough about the (complex) track
layout and platforming to know if that would give any useful increase in
capacity.

If the infrastructure elsewhere limits trains to ~240m long, there's no
advantage for anyone from the much longer platforms to be had.
(is there any realistic prospect of longer trains out of any part of
Waterloo?)

Theo