Swissmetro [1] was a precursor concept publicized in 1993 [2], abandoned by 2009. [1] https://www.researchgate.net/publication/255792073_Swissmetro_-_Project_D

Swissmetro [1] was a precursor concept publicized in 1993 [2], abandoned by 2009. [1] https://www.researchgate.net/publication/255792073_Swissmetro_-_Project_Development_Status https://www.researchgate.net/publication/255792073_Swissmetr... [2] PDF link to English-language report at the bottom of the page: http://www.bfe.admin.ch/dokumentation/energieforschung/index.html?lang=en&publication=2502 http://www.bfe.admin.ch/dokumentation/energieforschung/index...