Paragraph 13 I1

If any alterations or additions, either permanent or temporary, to railway property are reasonably necessary in consequence of the construction of a specified work, either—

then such alterations and additions may be carried out by Network Rail.

If Network Rail gives to the Harbour Authority reasonable notice of its intention to carry out alterations or additions as provided for in sub-paragraph (1), the Harbour Authority shall pay to Network Rail the reasonable cost of such alterations or additions including, in respect of permanent alterations and additions, a capitalised sum representing any increase in the costs which may be expected to be reasonably incurred by Network Rail in maintaining, working and, when necessary, renewing any such alterations and additions.

If the cost of maintaining, working or renewing railway property is reduced in consequence of any such alterations or additions referred to in sub-paragraph (1) a capitalised sum representing such saving shall be set off against any sum payable by the Harbour Authority to Network Rail under sub-paragraph (2).