1506 wrote:

AFIK extending the Bakerloo is fading back into obscurity. I don't
see any negative issues. But mixing tube with mainline and subsurface
stoke means that the platforms have to be compromise height. Better
in my view to keep the Bakerloo as is, and extend the East London Line.

That didn't seem to be a problem for the 65 years (1917-1982) that the
Bakerloo ran to Watford Junction. And of course it remains the situation
from Queens Park to Harrow & Wealdstone.

Peter Beale