English: Outline of the Pfaffensprung spiral tunnel and the double loop at Wassen on the northern ramp to the Gotthard tunnel. Deutsch: Pfaffensprung-Kehrtunnel und Linienentwicklung bei Wassen. 1914, book (or prior source predating the publication of volume 5 of Röll's encyclopedia in 1914) 51 PfaffensprungSpiralTunnel DoubleLoopCurvedAlignmentTunnels atWassen onNorthernRampToGotthardTunnel

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Photo credit: © History and Art Collection / Alamy / Afripics
License: Licensed
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