Posted by:
SuperCFL
(---.dsl.chcgil.sbcglobal.net)
Those boxes dated back to the 1920s at least. Chicago Surface Lines published a series of flyers (memory escapes me now..."Surface Service"?) and the "L" company published "Elevated News" and "Rapid Transit News". They were promotional literature touting businesses along the lines, service improvements, and the inevitable invitation to buy stock in the companies. All were dropped with the onset of the Depression in the early 1930s.