First link in subway is in operation along State St route through loop shopping district; new 5 mi, twin tube underground line speeds up North and South traffic and relieves some congestion in elevated loop section; mezzanine stations include escalator access to and from platforms at train level; modern lighting, ventilation and train control.
Chicago's first subway placed in operation
Eng News-Rec
Engineering News-Record ; 131 , n 17
1943
4 pages
Article (Journal)
English
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