Can anyone out there, let me know where I can obtain copies of maps
that show all the twist and turns of the London Underground lines?

I often travel on the Northern (Bank) Line and it amazes me the how
the line twists, turns, dips etc. One dip is on the Northern
(Bank)northbound line between Angel and Kings Cross St Pancras. I like
it because it wakes me up before my stop. What causes such a dip?
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