To avoid long detours via existing elevated lines, two direct subway sections are being constructed under Chicago; one of tunnels beneath Chicago River is prefabricated, towed to site and sunk in bed; methods of construction; subsequent subway extensions planned.
New Chicago subways
Ry Gaz
Railway Gazette ; 72 , n 22
1940
2 pages
Aufsatz (Zeitschrift)
Englisch
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