One of the largest interurban lines was the Chicago, Ottawa, and Peoria Line.  This ran along the Illinois Valley.   This was operational during the early 1900’s.  Eventually, the whole system closed in 1934. 

Chicago, Ottawa, and Peoria. Morris Station

Chicago, Ottawa, and Peoria. Mokena Station

Starved Rock Station

Chicago,Ottawa, and Peoria. Marseilles, Il.