In a tweet sent just after 4:20 a.m., Metra Milwaukee District North officials said Train No. 2102, departing Fox Lake at 4:46 a.m. was delayed after the pedestrian was hit.
At about 5:05 a.m., Metra officials said the train was expected to be about 15 to 20 minutes delayed.
It was not immediately clear if any other trains would be affected Wednesday morning.
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Emergency officials did not immediately provide information about the person who was struck.
This is a developing story; check back with ABC 7 Chicago for updates.