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"It is built as one double-track, standard gauge tunnel."
Then why does this picture clearly show two double-track tunnels?
The two tubes merge after a few hundred meters, its just some switches of Göschenen railway station that were put in the mountain. The single double-track tube can be clearly seen at the other end, near Airolo. --Kabelleger 11:37, 29 April 2007 (UTC)
I have heard the Gotthard Rail Tunnel uses a design that requires it to circle while changing altitude. If any experts can verify this, I believe it would be interesting in the article.Voiceperson (talk) 18:46, 19 August 2008 (UTC)
The Gotthard rail tunnel doesn't circle nor change altitude (well, a bit, but it's not really relevant). Maybe you're confusing it with other spiral tunnels of the Gotthardbahn? --Kabelleger (talk) 19:57, 19 August 2008 (UTC)
The rail was electrified in 1920. But how were the trains propelled until then? If it was steam, then were the boilers able to build enough pressure before entering the tunnel to drive it through? Did they stop firing when or before they entered the tunnel?