Such uses shall be limited to the erection, construction, alteration or maintenance, by public utilities or municipal or other governmental agencies, of electric, gas, water transmission or distribution systems or collection, communication, water supply or sewage treatment and collection systems, including poles, wires, mains, drains, sewer, pipes, conduits, cables, fire alarm boxes, police call boxes, traffic signals, light stanchions, telephone lines, hydrants and other similar equipment and accessories in connection therewith reasonably necessary for the furnishing of adequate services by public utilities or municipal or other governmental agencies or for the public health, safety or general welfare, but not including buildings.