Section 20
SEC. 20. After an order or requirement has-been made by the Board in any proceeding any interested party may at any time make application for rehearing of the same, or of any matter determined therein, and it shall lie lawful for the Board in its discretion to grant such a rehearing if sufficient reason therefor be made to appear. Applications for rehearing shall be governed by such general rules as the Board may establish. No such application shall excuse any public-service corporation from complying with or obeying any order or requirement of the Board, or operate in any manner to stay or postpone the enforcement thereof, without the special order of the Board. In case a rehearing is granted the proceedings thereupon shall, conform as nearly as may be to the proceedings in an original hearing, except as the Board may otherwise direct: and if, in its judgment, after such rehearing and the consideration of all fads, including those arising since the former hearing, it shall appear that the original order or requirement is in any respect, unjust or unwarranted, the Board may reverse, change, or modifying the same accordingly. Any order or requirement made after such rehearing, reversing, changing, or modifying the original determination shall be subject to the same provisions as an original order.