Historical version 2 of Anglia Railways (view current version)
Run out of Liverpool St into East Anglia.
Used to run a very useful 'crosslink' service up from Basingtoke, through Feltham & Brentford and then heading around part of the [North London Line]? before heading eastwards. Discontinued September 2002 due to 'lack of use', they tell me - although they confessed the service was serverely limited by the post-Hatfield crash restrictions and never really recovered from that.
Now we just have to wait for Crossrail...