partially tunneled rail line, between Community College and Haymarket, MBTA Orange Line Washington Street Tunnel, rail tunnel, between Haymarket and Chinatown, now the core of the MBTA Orange Line Southwest Corridor extension, partially tunneled rail line, between Chinatown and Mass Ave, MBTA Orange Line MBTA Red Line rail tunnels, north to south: Cambridge tunnel, rail tunnel, between Alewife and Longfellow Bridge, now part of the MBTA Red Line Dorchester Tunnel, rail tunnel, between Longfellow Bridge and JFK/UMass, now part of the MBTA Red Line MBTA road tunnels, north to south: Harvard Bus Tunnel, connects Harvard MBTA station under Harvard Square in Cambridge MBTA Silver Line, bus tunnel, between South Station and Silver Line Way under Fort Point Channel Hoosac Tunnel, rail tunnel, 1875, 4.75 miles (7.64 km) long, Pan Am Railways (formerly Boston and Maine Railroad), through the Berkshire Mountains between North Adams and Florida, Massachusetts The longest active transportation tunnel in North America east of the Rocky Mountains Prudential Center Complex tunnel, twin road tunnels and one rail tunnel, Massachusetts Turnpike/I-90 under Prudential Center Complex, Boston Michigan Detroit-Windsor Tunnel, road tunnel, Detroit to Windsor, Ontario, Canada under the Detroit River Michigan Central Railway Tunnel, twin rail tunnels, Canadian Pacific Railway (formerly Michigan Central Railway), Detroit to Windsor, Ontario, Canada under the Detroit River (two) St. Clair Tunnels, rail tunnels, Port Huron to Sarnia, Ontario, Canada under the St. Clair River original tunnel, 1891, abandoned and sealed c. 1994 current tunnel, c.1994, Canadian National Railway South Washington Avenue Tunnel, twin road tunnels, in Holland, under runway 8/26 at West Michigan Regional Airport Minnesota Eastman tunnel, defunct water tunnel; the tunnel ran downstream from Nicollet Island, beneath Hennepin Island, and exited below St. Anthony Falls; Minneapolis Ely's Peak Tunnel, abandoned rail tunnel, in use c. 1912–1984, Duluth, Winnipeg and Pacific Railway, Short Line Park southwest of Duluth, now a rail trail (four) Interstate 35 tunnels, short twin tunnels, between downtown Duluth and its end near London Road Lowry Hill Tunnel, twin tunnels, Interstate 94, near downtown Minneapolis Portland Tunnel, single 3-lane tunnel carrying eastbound traffic, Interstate 94 near downtown Minneapolis METRO Blue Line airport tunnels, twin bore light rail tunnels, under Runways 12L/30R and 12R/30L at Minneapolis–Saint Paul International Airport; Terminal 1–Lindbergh station is midway through the tunnel Selby Ave Trolley tunnel, two-track, abandoned and sealed, streetcar tunnel, former Twin City Rapid Transit under Selby Avenue and Shelby Hill, Saint Paul