NRLA (English Wikipedia)

"Overview". AlpTransit Portal. Berne, Switzerland: Federal Swiss Archives FSA, Federal Office of Transport FOT. Retrieved 1 July 2017.
"Construction". AlpTransit Portal. Berne, Switzerland: Federal Swiss Archives FSA, Federal Office of Transport FOT. Retrieved 1 July 2017.
"Agreement with Europe". AlpTransit Portal. Berne, Switzerland: Federal Swiss Archives FSA, Federal Office of Transport FOT. 2 May 1992. Retrieved 1 July 2017.
"Yes to the NRLA". AlpTransit Portal. Berne, Switzerland: Federal Swiss Archives FSA, Federal Office of Transport FOT. 27 September 1992. Retrieved 1 July 2017.
"The end of the 28-tonne limit". AlpTransit Portal. Berne, Switzerland: Federal Swiss Archives FSA, Federal Office of Transport FOT. 21 May 2000. Retrieved 1 July 2017.
"Yes to the Alps Initiative". AlpTransit Portal. Berne, Switzerland: Federal Swiss Archives FSA, Federal Office of Transport FOT. 24 February 1994. Retrieved 1 July 2017.
"Green light for the network option". AlpTransit Portal. Berne, Switzerland: Federal Swiss Archives FSA, Federal Office of Transport FOT. 20 February 1995. Retrieved 1 July 2017.
"Transport policy as financial policy". AlpTransit Portal. Berne, Switzerland: Federal Swiss Archives FSA, Federal Office of Transport FOT. 29 May 1995. Retrieved 1 July 2017.
"Yes to public transport funding". AlpTransit Portal. Berne, Switzerland: Federal Swiss Archives FSA, Federal Office of Transport FOT. 29 November 1998. Retrieved 1 July 2017.
"Results for Gotthard". AlpTransit Portal. Berne, Switzerland: Federal Swiss Archives FSA, Federal Office of Transport FOT. Retrieved 1 July 2017.
"High-profile guests at the opening ceremony". AlpTransit Portal. Berne, Switzerland: Federal Swiss Archives FSA, Federal Office of Transport FOT. 1 June 2016. Retrieved 1 July 2017.
"Results for Lötschberg". AlpTransit Portal. Berne, Switzerland: Federal Swiss Archives FSA, Federal Office of Transport FOT. Retrieved 1 July 2017.
"The Lötschberg enters operation". AlpTransit Portal. Berne, Switzerland: Federal Swiss Archives FSA, Federal Office of Transport FOT. 9 December 2007. Retrieved 1 July 2017.

alptransit.ch

"The Gotthard Base Tunnel". Luzern, Switzerland: AlpTransit Gotthard AG. Retrieved 15 October 2016.

bbc.co.uk

"Gotthard tunnel: World's longest and deepest rail tunnel opens in Switzerland". BBC News. 1 June 2016. Retrieved 1 June 2016.

bls.ch

"BLS is upgrading the Lötschberg Base Tunnel". www.bls.ch.

geomatik.ch

"Gotthard- und CeneriBasistunnel: die neue Gotthard-Bahn nimmt Gestalt an" (PDF). Geomatik Schweiz. Archived from the original (PDF) on 4 March 2016. Retrieved 8 June 2015.

leica-geosystems.com

"Gotthard Base Tunnel: Tunnel technology for the future" (PDF). Heerbrugg, Switzerland: Leica Geosystems. Retrieved 1 July 2017.

railjournal.com

"Planning contract awarded for Lötschberg Base Tunnel track doubling". 1 February 2016.

railway-news.com

"Lötschberg Base Tunnel Upgrade Enters Next Stage". railway-news.com.

railwaygazette.com

"Festival marks Gotthard Base Tunnel opening". Railway Gazette. DVV Media UK Ltd. 1 June 2016. Archived from the original on 1 June 2016. Retrieved 1 June 2016.

spiegel.de

Shafy, Samiha (31 December 2006). "Elevator to the Underworld". Der Spiegel. Hamburg, Germany. Retrieved 1 July 2017.

tagesanzeiger.ch

"Wer hat die grösste Röhre?" [Who has the longest tube?]. Tages-Anzeiger (graphical animation) (in German). Zürich, Switzerland. 14 April 2016. Retrieved 11 May 2016.

tunnel-online.info

"Plans for Further Development of the Lötschberg Base Tunnel Enter Next Stage". www.tunnel-online.info.

tunneltalk.com

"Lötschberg plans full rail baseline finish". www.tunneltalk.com.

web.archive.org

"Gotthard- und CeneriBasistunnel: die neue Gotthard-Bahn nimmt Gestalt an" (PDF). Geomatik Schweiz. Archived from the original (PDF) on 4 March 2016. Retrieved 8 June 2015.
"Festival marks Gotthard Base Tunnel opening". Railway Gazette. DVV Media UK Ltd. 1 June 2016. Archived from the original on 1 June 2016. Retrieved 1 June 2016.