It is true that the future timetable – the timetable which the appraised project will enable – often attracts interest, even if there is seldom any explicit principle guiding its construction. However, much less though tis usually put in to constructing the timetable in the do-nothing scenario, despite the fact that it is well known that the definition of the do nothing scenario is always crucial in any CBA exercise. That scenario should be the best possible alternative if the project is not carried out. Although this principle is often difficult to apply in practice, the idea can be operationalized by evaluating many alternatives and rank them mutually. Van Wee (2007) discusses the importance of the do nothing alterative in the context of railway CBA further