Browse Items (1 total) Tags: Substation Browse All Browse by Tag Search Items Sort by: TitleCreatorDate Added Photos of Illinois Power Co. Transmission Substation and the Illinois Power Co. office building. Photograph of the Illinois Power Co. Substation. Photo of the Illinois Power Co. office building on E. Main St., Decatur, IL. Tags: Buildings, Business, Decatur IL., E. Main St., Illinois Power Co., Noel C. Dicks, Office Building, Photo File: Business, Power Company, Substation Featured Item Besalke Family Under a Bell Photograph of the Besalke family standing under a bell in July 1959.