§ 86. Certain railroads need not be operated beyond June, July, August and September. Subject to the permission and approval of the commissioner of transportation, any corporation, whose railroad is or shall be not longer than sixteen miles and is or shall be in large part intended for or used in summer travel for the convenience of summer sojourners need not operate its road beyond the months of June, July, August and September, inclusive. The motive power may be electricity. If the road be not longer than ten miles, such corporation may fix and collect fare for transporting each passenger, together with ordinary baggage, if any, not to exceed fifteen cents for each mile and fraction thereof.