The metaphor “a window into the past”

Transport is drawing so close to you now that through its window you can see where behind the Motorman’s shoulder you will ride. Place his obolus in your mouth for the fare and prepare to board.

Source: Library of Congress, http://www.loc.gov/pictures/item/2004677189/. Photoshopped.

Origin and terminus: Louisville, Kentucky, March 5, 1923.