Gary Jenkins wrote:

I've never understood why all the southern extensions will run from
New X Gate rather than being shared between New X Gate and New X. As
a result passengers from outer South-East London will hardly benefit
at all from the ELL extension.

In a nutshell - capacity issues at Lewisham, which would be extremely
expensive to resolve.

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