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Die Gleisanlagen der Reichsbahn in und um Berlin [Tracks of the Imperial Rail System in and around Berlin]



Schnellbahnplan von Berlin [Plan of Berlin Rapid Transit]



Plan des Liniennetzes der Berliner Straßenbahn im Jahre 1914 [Berlin Street Trolley Lines in 1914]
Here the thickness of the line corresponds to the amount of trolley traffic per hour.
DER HUNDEKOPF

from Artur Fürst, Das Weltreich der Technik (volume II), 1924.

download TIFs:
Gleisanlagen (3000x2400, 4.75MB)
Schnellbahn (2000x1450, 3.25MB)
Straßenbahn (2000x1450, 1.15MB)
[best with alternatiff.]

The rail line built around Berlin was known colloquially as Der Hundekopf — The Dog's Head — because of the shape it made on the map. Alas, today official maps abstract the ring line into a chamfered rectangle.