Ohio Rev. Code Ann. § 723.41

No grant or renewal of a grant for the construction or operation of a street railway shall be valid for a greater period than twenty-five years from the date of such grant or renewal, and after such grant or renewal is made, whether by special or general ordinance, the municipal corporation shall not, during the term of the grant or renewal, release the grantee from any obligation or liability imposed by the terms of such grant or renewal.