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Bore it as crossrail 3 from Gatwick via Lewisham to The Elephant, Then on to Battersea Interchange, Bond Street, Edgware Road Interchange and then take over the Aylesbury Line to Marylebone.
Thinking about the unloading times that would be the reason for the two 4DD units ran fast from London to Eltham Well Hall. They were cramped and if tall you wouldn't to use the stifling upper deck. The ventilators never worked. I used to travel in the front unit to be near the peak time exit...
It would be nice if they could be restored One as built in green The Other in suburban blue. as a couple of Trailer class ( so no motors) and a class 73 to power them. In 1973 I used to travel home in them from Waterloo East to Eltham Well Hall