Historical Map: Gotthardbahn Brochure Diagram, 1957
I absolutely love this almost abstract representation of the Gotthardbahn from a Swiss advertising brochure from 1957. Just major cities, the distinctive loops and spirals of the line (described in detail in this post from 2014) and the famous 15-kilometre-long Gotthard Tunnel shown illustratively cutting through a massive mountain. Source: Retours.eu