On 17 Mar, 19:40, Tom Anderson wrote:
Not really possible. However, a plan was proposed here many moons ago to
four-track the NLL throughout, from Stratford to Camden Road west
junction; there's room in the formation to do it, with apparently only a
modest amount of land take needed towards the eastern end. With a flyover
at each end, you'd have a dedicated, grade-separated two-track freight
route across London, taking freight trains out of the NLL picture
altogether.

You might not need much extra land, but widening the formation east of
Dalston is surely beyond what's practical?

U