English: A map of the variant "K 12,5" for a Stuttgart-Ulm high-speed railway line. A ~20 km tunnel between Stuttgart and the area of Plochingen, with a four-track station underneath a 16-track terminus (to be kept), was a key element of this variant. While only the greater Stuttgart area is depicted on the map, this line would have continued to Ulm. The route is derived from the plans for the official approval process. The underlying map is based on Karte_Stuttgart_21_aussen_Kartenwerkstatt.svg, a public domain map by K. Jähne (kjunix).
While existing rail lines are depicted in black, the new high-speed line is in red. Dotted lines are used for tunnels.