Nr.  | Kontakt | Jahr | Name  | Strasse | Art | Länge |
|---|---|---|---|---|---|---|
| 471 | SBB | 1997 | Aarau | EB | 567 | |
| 1100 | 1973 | Aarau Galerie de secours | AT | 200 | ||
| 432 | SBB | 1857 | Aarburg | EB | 87 | |
| 718 | 2000 | Aéroport Zürich-Kloten Galerie de transport des bagages | AT | 1'786 | ||
| 200 | Simmenthaler Kraftwerke AG (BH) | 1958 | Abendberg-Stollen | KW Erlenbach | WS | 5'052 |
| 288 | Kanton Nidwalden | 1964 | Achereggtunnel I | A2 | ST | 550 |
| 1042 | Kanton Nidwalden | 1964 | Achereggtunnel II | A2 | ST | 550 |
| 112 | Kanton Graubünden | 1994 | Aclatobel | 746 (Safierstrasse) | ST | 1'712 |
| 41 | Forces Motrices de Mauvoisin SA | 1956 | Adduction rive droite, Barrage de Mauvoisin | Barrage de Mauvoisin | WS | 6'994 |
| 42 | Forces Motrices de Mauvoisin SA | 1956 | Adduction rive gauche, Barrage de Mauvoisin | Barrage de Mauvoisin | WS | 6'498 |
| 1065 | SBB Bern AG | 2000 | Adlertunnel | Hauensteinlinie (Linie Basel Olten) | EB | 4'264 |
| 773 | Bodensee - Toggenburg - Bahn | 1910 | Aesch - Tunnel | Degersheim - Mogelsberg | EB | 92 |
| 956 | Kanton Zürich | 2006 | Aescher I | A4 | ST | 2'100 |
| 957 | Kanton Zürich | 2006 | Aescher II | A4 | ST | 2'100 |
| 1101 | 1990 | Albeuve Galerie | WS | 215 | ||
| 472 | SBB | 1897 | Albis | EB | 3'359 | |
| 861 | RhB Rhätische Bahn AG | 1903 | Albula | Landquart - Chur - Thusis - St.Moritz (Albulalinie) | EB | 5'865 |
| 48 | Societe des forces motrices du GD-St. Bernhard | 1958 | Alleves | Galerie d'amenèe rive droite | WS | 235 |
| 1102 | 1994 | Altdorf Tunnel du Amsteg | WS | 7'200 | ||
| 496 | SBB | 1882 | Alte Gruonbachgalerie | Sisikon / Gruonbach (Spw) | EB | 100 |
| 219 | SBB | 1922 | Alter Druckstollen (Pfaffensprung-Amsteg) | Kraftwerk Amsteg | WS | 7'535 |
| 608 | Stadt Zürich Tiefbauamt (TAZ) | 1927 | Alter Ulmbergtunnel | Strassentunnel, früher Eisenbahntunnel | ST | 255 |
| 92 | Kanton Graubünden | 1975 | Alvaschein | H417a (Schinstrasse) | ST | 927 |
| 834 | RhB Rhätische Bahn AG | 1903 | Alvaschein | Landquart - Chur - Thusis - St.Moritz (Albulalinie) | EB | 609 |
| 186 | Energie-Beteiligungsgesellschaft AG (EBG) | 1989 | Anfassungsstollen Bortelsee | KW Bortel | WS | 300 |
| 428 | SBB | 1875 | Angenstein | Delémont Est - Basel SBB Ost | EB | 64 |
| 863 | RhB Rhätische Bahn AG | 1904 | Argenteri | Landquart - Chur - Thusis - St.Moritz (Albulalinie) | EB | 114 |
| 969 | Kanton Basel-Landschaft | 1970 | Arisdorf I | A2 | ST | 1'360 |
| 970 | Kanton Basel-Landschaft | 1970 | Arisdorf II | A2 | ST | 1'360 |
| 819 | RhB Rhätische Bahn AG | 1914 | Arosa | Chur - Arosa (Aroserlinie) | EB | 299 |
