On 29 Jul, 00:29, 1506 wrote:
Met line to Liverpool Street main line

Crossrail will do this better.

Depends which eastern line you were after. Crossrail will relieve the
GEML, but the WAML won't be relieved until the quad tracking (though I
suppose Crossrail could serve it via Stratford, maybe...Heathrow to
Stansted), and even then it will do nothing for the suburban services
via Bethnal Green. I wonder if diverting the H&C trains from Barking
to Enfield and/or Cheshunt via Liverpool Street and then running the
Met to Barking would be worthwhile. It'd free up some suburban
capacity at Liverpool Street if those suburban services became through
trains.