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Possibly stretching the concept of a line in this context, IIRC the Tanners Hill flydown (Lewisham, SE London) was built as a single track in the 1970s, but later doubled in the 2010s
(edited to clarify location)
Crayons out for a moment...even if the sums added up I doubt it would happen soon.
It's widely known that 3rd rail + OHLE are very difficult on the same track, but what about 4th rail and OHLE together?
In an earlier idea for Crossrail, the line to Aylesbury was mooted as a branch (and then...
I once stood behind Mick McCarthy on the escalator at Charing Cross
Sat next to James Mates waiting for a connect train at Heathrow T1/2/3
Sat opposite Rhodes Boyson on a train between Sevenoaks and Orpington (he was fast asleep)
One summer evening rush hour, making my then usual dash...