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 #1416406  by jonnhrr
 
There was a plan in the 1940's to connect the Dearborn subway to the Lake St. L (either kept as an L or partially converted to a subway). They built these stubs as part of this plan. This plan never happened of course.

For more detail see this in Chicago-L.org: http://www.chicago-l.org/FAQ.html#6.2

Jon