(snip the idea)

Interesting idea. My personal quibble is the loss of direct trains from
South Kensington/Gloucester Road to Baker Street.

You also have 2 extra trains per hour crossing on the flat at the key
junctions (Edgware Road, Gloucester Road, Aldgate East). That may be a
problem at Gloucester Road Junction in particular unless either inner
"Circles" (i.e. Edgware Rd - Tower Hill - Upminsters) were timed to
approach Gloucester Road station at the same time outer "Circles" were
leaving for HSK - otherwise one or the other would get delayed by or
would delay eastbound "Districts" heading for Victoria.

Reinstating the second eastbound platform at Gloucester Road would help
as it would allow inner "Circles" to arrive at Gloucester Road
simultaneously with eastbound "Districts", with departures regulated
from there.

Unfortunately such a platform reinstatement would require expensive
reconstruction (narrowing) of the island platform at Gloucester Road.


--
Dave Arquati
Imperial College, SW7
www.alwaystouchout.com - Transport projects in London