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Ah.
The Underground.
Or at this point the overground; it only plunges beneath later on.
If you split the photo in two halves, right and left, the right hand side is entirely tracks and trees. That is the Piccadilly, to South Harrow, and Cockfosters.
On the left hand side is the Metropolitan, to West Harrow, and Aldgate, the train snakes in, with definite curvature, for it must negotiate the steep bend to the right that is coming up.
