27.—(1) Network Rail may compulsorily acquire so much of the subsoil of the land referred to in paragraph (1)(a) or (b) of article 24 (power to acquire land) as may be required for any purpose for which that land may be acquired under that provision instead of acquiring the whole of the land.
(2) Where Network Rail acquires any part of the subsoil of land under paragraph (1) it shall not be required to acquire an interest in any other part of the land.
(3) Paragraph (2) shall not prevent article 31 (acquisition of part only of certain properties) from applying where Network Rail acquires a cellar, vault, arch or other construction forming part of a house, building or factory.