www.sbb.ch/en
www.sbbcargo.com
www.bbc.com/news/world-europe-36423250
www.cnn.com/travel/article/trans-alpine-rail-tunnels/index.html
www.structurae.net/structures/gotthard-base-tunnel
www.runthealps.com/sbb/
https://en.wikipedia.org/wiki/Gotthard_Base_Tunnel
https://en.wikipedia.org/wiki/Swiss_Federal_Railways
https://en.wikipedia.org/wiki/NRLA
https://en.wikipedia.org/wiki/Rail_2000
https://en.wikipedia.org/wiki/IC_2000
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