Power to deviate
12. In constructing or maintaining any of the scheduled works, Network Rail may—
(a)deviate laterally from the lines or situations shown on the deposited plans to the extent of the limits of deviation for that work; and
(b)deviate vertically from the levels shown on the deposited sections—
(i)to any extent upwards not exceeding 0.5 metres in relation to Work Nos. 1A and 1B;
(ii)to any extent upwards not exceeding 3 metres; or
(iii)to any extent downwards as may be found to be necessary or convenient.