[lmm]

Crossrail is also ahead of schedule and under budget (taking into account an explicit decision to delay it for a year but allow them to reduce the original budget by 1bn). They've done it by ruthlessly resisting scope creep. The flipside of that is that things added on later will end up costing more overall (e.g. adding the station at Old Oak Common and the connection to the WCML to relieve capacity while Euston is rebuilt for HS2) than if they were done as part of Crossrail.