Ohio Rev. Code Ann. § 4907.54

If the tracks of a railroad or electric railway cross at grade the tracks of a railroad or electric railway previously constructed, the former shall provide interlocking works or other fixtures satisfactory to the public utilities commission at such crossing, and pay the costs of such fixtures and the expenses of installing them. The maintenance and operation of such fixtures shall be apportioned equally between the railroads by the commission. This section does not apply to crossings of sidetracks only.