What ideas were there on the expansion of the Gotthard Route in the 1960s?
ETH-Bibliothek has now licensed the Engineering Index Backfiles. The database comprises metadata on 1.7 million technical publications from 1884 to 1969.
Searches are performed on the Engineering Village Platform (external link) by ticking the database "Ei Backfile". The entries also contain information on how the printed or electronic full text is available.
Incidentally, searching the word "Gotthard" yields fifty-seven hits. These also include an article from 1968 on the overall expansion of the Gotthard route. The proposal of a novel "car train", a novel idea at the time and referred to as a car shuttle train these days, is being revisited as part of the road tunnel upgrade.