51.—(1) Any pile, stump or other obstruction which becomes exposed in consequence of the construction of a specified work must be removed by Network Rail or, if it is not reasonably practicable to remove it, must be cut off at such level below the bed of the waterways as the Trust may direct.
(2) If Network Rail fails to remove any such pile, stump or other obstruction within 28 days after receipt of written notice from the Trust requiring the removal, the Trust may carry out the removal and recover its costs from Network Rail.