Situation of the northern part of the Gotthard axis as part of the New Rail Link through the Alps NRLA / Alptransit project in Switzerland with Gotthard and Zimmerberg base tunnels (yellow: major tunnels, red: existing main tracks, numbers: year of comple

Situation of the northern part of the Gotthard axis as part of the New Rail Link through the Alps NRLA / Alptransit project in Switzerland with Gotthard and Zimmerberg base tunnels (yellow: major tunnels, red: existing main tracks, numbers: year of completion)