Requests for changes to aligned track possessions must be submitted to the NPM no less than 28 days prior to the commencement of the scheduled possession.
Requests are to be accompanied by a detailed description of why the approved aligned possession (or part thereof) is to be cancelled. The Network Planning Manager shall be responsible for decisions relating to an approval to change all or part of an aligned possession.
As the primary focus of possession planning is to reduce the effect of track closures on rail operations by aligning CRN possessions with those of adjacent networks, cancelling an aligned possession will only occur when no alternative strategy is available.