Article 7 Levels and formation of railway

The railway shall be laid on the same levels as, and upon the existing formation of, the former railway, except for the length of the railway between a point 25 metres to the west of the centre of Prior’s Bridge and a point 100 metres east of the centre of that bridge, where the railway shall be laid within the existing formation but at a level no more than 70 centimetres below the level of the former railway.