It's been a long time since there has been a costing review with the regulation within the revenue cap. Going forward to make sure the right elements are costed correctly, it would make sense to actually do a costing review to make sure the incentives are there, the railways get fairly compensated for what they move, and that over time the technological improvements are reflected in the cost, because it's important to be competitive in the long run.
On April 2nd, 2014. See this statement in context.