In 1988 the NRLA project management presents five options for the NRLA to Federal Councillor Adolf Ogi: Lötschberg-Simplon, Gotthard, Ypsilon and two involving Splügen. This work forms a key basis for the Federal Council Dispatch of 23 May 1990 on the construction of the «Swiss rail line through the Alps». It recommends pursuing the Gotthard and Lötschberg-Simplon options.
« Gotthard and Lötschberg/Simplon are better than Ypsilon and Splügen. »NRLA project management, Federal Office of Transport, Decision-making basis for a rail link through the Alps, p. 3, 12.07.1988