Railroad securities. Interest rates for carriers, hearings on S. 3772, to authorize reduction of and to fix rate of interest to be paid by carriers upon notes or other evidences of indebtedness heretofore issued under provisions of sec. 207 of transportation act, 1920, or sec. 210 of said act its amended by act approved June 5, 1920; Jan. 14 and 15, 1925.