Thunderbug wrote:
Going north from central London towards Edgware, which is the first
above-ground station?

I'm giving a visitor some travelling directions and would like to say "call
us when you get to station"


On the Edgware branch that will be Golders Green. If your visitor
leaves it a bit late to call until getting to Hendon, then there is
another tunnel between there and Colindale.

PhilD

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