1506 wrote:

There might be some merit in linking the Met. and the Chiltern Network
north of the Marylebone throat where the Met surfaces to cross the
Regents Canal. In theory that would allow the Amersham fasts to avoid
al of those Met Line bottlenecks. OTOH it would be a flat crossing.

There's barely enough capacity at Marylebone with the existing Chiltern
and WSMR services, let alone trying to squeeze in an extra four Met
trains an hour.

Hint: One of the big operational constraints in Chiltern land is that
it's presently a mainly two track railway all the way from Marylebone to
Birmingham, though Evergreen 3 is designed to alleviate some of that
with strategic "through lines" at key points.

It is a pity that those empty tunnels under Lord's Cricket Ground
cannot be put to some use considering the traffic load on the Met at
that point.

If memory serves, aren't the "spare" tunnels on the wrong side of
the Chiltern line to be any use to the Met?

Cheers,

Barry