Wikipedia sources:
Bering Strait bridge •
Bern-Lötschberg-Simplon railway •
Big Dig (Boston, Massachusetts) •
Bridges and tunnels in New York City •
Brooklyn-Battery Tunnel •
Channel Tunnel •
City Loop, Melbourne •
Double track •
Downtown Seattle Transit Tunnel •
Great Belt Fixed Link •
High Speed 1 •
Interstate 895 (Maryland) •
Megaproject •
Michigan Central Railway Tunnel •
Nuremberg U-Bahn •
Oldest railroads in North America •
Oresund Bridge •
Oslo Sentralstasjon •
Port Huron, Michigan •
RER •
Royal Aircraft Establishment •
Secret passage •
Silver Line (MBTA) •
Silver Line (Washington Metro) •
St. Gotthard Pass •
Trans Global Highway •
Transport in Milford Sound •
Trent and Mersey Canal •
Tunnel •
Tunnel boring machine
Related terms:
bechtel •
big dig •
bridge •
buses •
canal •
channel tunnel •
copenhagen •
double track •
downtown •
exit •
ferry •
interstate •
logan airport •
michigan •
new york •
new york city •
rail transport •
railway •
rapid transit •
road tunnel •
signalling •
subway •
tbm •
thumb •
toll •
traffic •
train •
transit •
tunnel •
tunnel would