It starts, really, with the design phase—to have a long-term plan. As I was saying, which one is the most successful? Switzerland and Austria are the most successful, because they have a long-term timetable. They have a clear view of what the timetable will look like in 2070, so they can say at which stage and on which day of the week, in the year 2071, a freight train or high-speed train will go from Zurich to Geneva. Then they focused all their industry capabilities on this plan. That's really the plan. You need a long-term plan, and then each change request will increase the costs.
You need a clear vision, and then you will also have a very effective and productive mission to it.