An Act to validate a certain conveyance heretofore made by Central Pacific Railway Co., a corporation, and its lessee, Southern Pacific Co., a corporation, to the State of Nevada, involving certain portions of right-of-way in the city of Reno, county of Washoe, State of Nevada, acquired by the Central Pacific Railway Company under the Act of Congress approved July 1, 1862 (12 Stat. L. 489), as amended by the Act of Congress approved July 2, 1864 (13 Stat. L. 356)