Power to deviate

6.  In constructing or maintaining the railway, the Commissioners may—

(a) deviate laterally from the lines or situations shown on the deposited plans to the extent of the limits of deviation for the railway; and

(b) deviate vertically from the levels shown on the deposited sections—

(i) to any extent not exceeding 1 metre upwards; or

(ii) to any extent not exceeding 2 metres downwards.