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| Keywords: IllinoisTunnelMap1902.png en Original Caption Showing Conduits as Completed Sept 1 1902 Retouched to remove spots and improve legibility The short side spurs terminating in dots are the shafts used to construct the tunnel system George W Jackson Scope Extent and Construction of the Underground Conduits of the Illinois Telephone and Telegraph Co in Chicago http //books google com/books id DJ4PAQAAIAAJ pg PA495 Journal of the Western Society of Engineers Vol VII No 5 Oct 1902 ; page 495 George W Jackson died 1922 1902-10 <gallery> file IllinoisTunnelMap1904 png 1904 tunnel map file IllinoisTunnelMap1910 png 1910 tunnel map file 1937 Chicago Tunnel Terminal Company jpg 1937 tunnel map </gallery> Chicago Tunnel Company Old maps of Chicago Rail transport maps of the United States PD-old | ||||
