Northern terminus. Four-car units, every four minutes at rush hour.
Harry Beck drew the first London Underground diagram in 1931, and the thing he noticed was that a geographically accurate map is a map people cannot use. Distance on the ground has nothing to do with how long the journey takes or how easy it is to change lines.
So the diagram lies, deliberately and in every direction, and in exchange it tells you the only three things that matter: which lines you can take, where they cross, and what the interchange is called. Everything here follows that rule — the angles are all multiples of 45 degrees, the spacing is constant, and geography has been left at the door.