The regulations of this chapter shall not be so construed as to limit or interfere with the dedication, development or use of any land or building for public parks, public playgrounds or public schools required for compulsory education; or with the use of land or buildings owned by the United States Government, the Commonwealth of Pennsylvania, the County of McKean, the City of Bradford or the City of Bradford Parking Authority and used for governmental purposes; or with the construction, installation, operation and maintenance for public utility purposes of water or gas pipes, mains or conduits, electric lights or electric power transmission lines or distribution lines, telephone or telegraph lines, oil pipelines, sewers, sewer mains or incidental appurtenances; or with any highway or railroad right-of-way existing or hereafter authorized by the Commonwealth of Pennsylvania, the County of McKean or the City of Bradford. These exceptions, however, shall not be interpreted to permit storage yards, garages or other buildings for service or storage by said public utilities which are otherwise prohibited by this chapter in appropriate zoning districts.