It is too early to confirm to what extent improved capability will be delivered under the PPPs by the contractual dates because most upgrade work will not be completed for a number of years. However, the minimum capability enhancements that the Infracos must deliver represent an overall capacity increase of 12 per cent by 2011. In the first 7½ years, only a limited amount of capability upgrade work is expected to occur - for instance, the interim line upgrades on the Central and Victoria lines which are expected to be delivered by 2009.
As referenced in A1.2, the Infracos must also ensure that assets reach a "steady state" condition by 2026.