1.—(1) The following provisions of this Schedule have effect unless otherwise agreed in writing between the undertaker and Network Rail.
(2) In this Schedule—
“construction” (“adeiladu”) includes execution, placing, alteration and reconstruction and “construct” and “constructed” have corresponding meanings;
“the engineer” (“y peiriannydd”) means an engineer to be appointed by Network Rail for the purpose in question;
“plans” (“planiau”) includes sections, designs, drawings, specifications, soil reports, calculations, descriptions (including descriptions of methods of construction) and programmes;
“protective works” (“gweithfeydd diogelu”) means works specified by the engineer under paragraph 5(1);
“Network Rail” means Network Rail Infrastructure Limited except that any reference to costs or losses incurred or suffered by Network Rail includes reference to costs or losses incurred or suffered by any relevant associated company;
“relevant associated company” (“cwmni cysylltiedig perthnasol”) means any company which is (within the meaning of section 736 of the Companies Act 1985(1)) the holding company of Network Rail Infrastructure Limited, a subsidiary of Network Rail Infrastructure Limited or another subsidiary of the holding company of Network Rail Infrastructure Limited and, in any of these cases, holds or uses property for railway purposes;
“railway property” (“eiddo'r rheilffyrdd”) means any railway belonging to Network Rail and any works, apparatus and equipment belonging to Network Rail or a relevant associated company connected with any such railway and includes any land held or used by Network Rail or a relevant associated company for the purposes of such railway or works, apparatus or equipment;
“relevant work” (“gwaith perthnasol”) means—
so much of any of the authorised works as is situated upon, across, under, over or within 15 metres of, or may in any way adversely affect, railway property; and
to the extent that it is not an authorised work, any protective work constructed by the undertaker.