23.—(1) Any specified work and any protective works to be constructed by virtue of paragraph 22(4) must, when commenced, be constructed—
(a)without unnecessary delay in accordance with the plans approved or deemed to have been approved or settled under paragraph 22;
(b)under the supervision (where appropriate and if given) and to the reasonable satisfaction of the engineer;
(c)in such manner as to cause as little damage as is possible to railway property; and
(d)so far as is reasonably practicable, so as not to interfere with or obstruct the free, uninterrupted and safe use of any railway of Network Rail or the traffic on it and the use by passengers of railway property.
(2) If any damage to railway property or any such interference or obstruction is caused by the carrying out of, or in consequence of the construction of a specified work or a protective work, the undertaker must, regardless of any such approval, make good such damage and must pay to Network Rail all reasonable expenses to which Network Rail may be put and compensation for any loss which it may sustain by reason of any such damage, interference or obstruction.
(3) Nothing in this Part of this Schedule imposes any liability on the undertaker with respect to any damage, costs, expenses or loss attributable to the negligence of Network Rail or its servants, contractors or agents, or any liability on Network Rail with respect of any damage, costs, expenses or loss attributable to the negligence of the undertaker or the undertaker’s employees, contractors or agents.