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I used to regularly travel on the eastern end of the Central Line in the 1980s and 90s and it seemed like standard practice to keep lights off on the open air sections in daylight. Sometimes the guard would wait until the rear car (where the guards position was) was in the tunnel after Leyton...
I believe there are a few remnants of dual gauge track from the Woolwich system, deeply hidden in a plot of land near Thamesmead Morrisons, which is inaccessible and contaminated.
(The land, not Morrisons).
I caught a train from Tottenham Court Road to Abbey Wood around 8pm. It departed from the westbound platform, I think an Abbey Wood - Tottenham Court Road shuttle for a couple of hours, reversing at the crossover near Farringdon.
I saw that happen recently on the Jubilee line, ie train door opened but PED didn't. Someone decided to force the PED to open, but the train door closed whilst he was doing so. Thankfully he got the PED open before the train started moving.
No. I don't work in the railway industry. If I was asked at around 3pm to work until eg 11pm, when I was planning to finish at 5 or 6pm, I would have no problem saying no. I value my own time.
I'd imagine that six platforms at Charing Cross going into two tracks would create lots of conflicting moves and potential for blocking back if trains are running out of sequence.