The 1910 OGR reveals that Erie did indeed run a "local" train originating daily in Rochester at 4:30 a.m. and arriving in Chicago at 9:35 a.m., and another train leaving Chicago at 4:45 p.m. and terminating in Rochester at 8:15 p.m.:
From the Chicago arrival and departure times, I suppose one could call that "commuter service." Talk about extreme commuting, though.
You might want to inquire further on the talk page of the person who put that info on Wikipedia (it turns out it's the person who created the Dearborn Station article -- the info has been there since the beginning):
Someone else challenged him on including the Cincinnati, Hamilton and Dayton Railway and Cincinnati and Lake Erie Railroad as using Dearborn Station, noting that these were interurban streetcar lines that never entered Chicago. He never responded, and that info was subsequently removed.