The nominated undertaker may construct and maintain the works specified in Schedule 1 ("the scheduled works"), being—
Subject to subsections (3) to (5), the scheduled works shall be constructed—
In constructing or maintaining any of the scheduled works, the nominated undertaker may deviate laterally from the lines or situations shown on the deposited plans to any extent within the limits of deviation for that work so shown.
In constructing or maintaining any of the scheduled works, the nominated undertaker may deviate vertically from the level shown for that work on the deposited sections to any extent downwards.
In constructing or maintaining any of the scheduled works, the nominated undertaker may, subject to subsection (6), deviate vertically from the level shown for that work on the deposited sections to the following extent upwards—
In the case of any station, depot or shaft for which an upper limit is shown on the deposited sections, the power of deviation under subsection (5) is subject to the limit so shown.