Mr Thant wrote:

How does it help the throughput of passengers (surely the whole point
of a transport system) if half the people currently travelling through
Camden Town without getting off now have to change there, causing
congestion and taking longer for their journeys?

Ah, but you're assuming everyone currently waits for a direct train,
which half the time will be the second one. The increase in people
changing is balanced perfectly by the reduction in people waiting for
the second train.

In other words, whatever service pattern you run, half of all journeys
will involve either waiting for the second train or changing at
Camden. So you might as well run the one that allows a much more
frequent service.

What about the increase in journey times for people who'd have to change at
Kennington? A large proportion use the Charing Cross branch,