Paragraph 7 I1

If within 56 days after such plans have been furnished to LUL, LUL gives notice to the undertaker that LUL desires to construct any part of the specified works, which in the opinion of the engineer will or may affect the stability of railway property and the safe operation of the railways of LUL or the services of operators using the same, then, if the undertaker desires such part of the specified works to be constructed, LUL shall construct it with all reasonable dispatch on behalf of, and to the reasonable satisfaction of, the undertaker in accordance with the plans approved or deemed to be approved or settled as provided in paragraph 6 above.