AN ACT TO AMEND PARAGRAPH SIX OF SUBSECTION TWO OF SECTION ONE OF ACTS NUMBERED FIFTEEN HUNDRED AND TEN, TWENTY-EIGHT HUNDRED AND THIRTY-SIX, AND THIRTY-THREE HUNDRED AND NINETY-NINE, TO AUTHORIZE THE MANILA RAILROAD COMPANY OF THE PHILIPPINE ISLANDS TO CONSTRUCT TOLL VIADUCTS, TOLL BRIDGES, AND TOLL TUNNELS.