On 8 Oct, 11:12, "David A Stocks" wrote:
"lonelytraveller" wrote in
No, because although it parallels the central line, it misses a lot of
key interchanges - especially holborn and oxford circus, where traffic
from Kings Cross meets it.

But by the time it's up & running a lot of "traffic from Kings Cross" will
be able to stay on their train to Farringdon and change there.

D A Stocks

If they stayed on the Piccadilly, Victoria, or Northern lines, then
they would miss Farringdon completely. Farringdon isn't much of an
alternative junction for these routes - all you'll cause is even more
traffic on the metropolitan/H+C/Circle line. And if you are going
westwards, then it's in completely the opposite direction.