Here’s a beautiful map from 1954, showing the lines of the Compañía General de Ferrocarriles Catalanes (CGFC), the predecessor of today’s Llobregat–Anoia commuter rail line.
The map is mainly notable for its restrained use of the four colours available to it: black line work with blue, red and yellow all performing precisely one function each.
I also enjoy the economical depiction of Barcelona, which is represented solely by Montjuic, the port area and the towering Columbus Monument. Each of the major towns on the route gets a notable building as well — although the monastery at Montserrat is high above the town itself, connected to it by the famous cable car. Suria and Sallent would seem to be represented by their salt mines, major reasons for these towns to even have a rail connection.
Top marks for the lovely ornate north pointer, in perspective to boot!
Source: Terminus CET/Twitter