20. (1) The provisions of sections 17, 18 and 19 with respect to the opening of the railway shall extend to the opening of the works mentioned in sub-section (2) when those works form part of, or are directly connected with, the railway used for the public carriage of passengers and have been constructed after the inspection which preceded the first opening of the railway.(2) The works referred to in sub-section (1) are additional lines of railway, deviation lines, stations, junctions and crossings on the level, and any alteration or re-construction materially affecting the structural character of any work to which the provisions of sections 17, 18 and 19 apply or are extended by this section.