In this study, the benefit-cost analysis technique for projects evaluation is applied to determine the minimum level of demand that makes a high-speed rail project economically viable in Spain. To get this goal, it is nec- essary to take into account not only the costs and benefits of the high speed railway but also the analysis of the costs and benefits linked to other alternative transport modes, such as plane, private car or bus. The re- sults show that the high-speed rail studied is socially profitable from a traffic volume of 6.5 million passen- gers and for a social discount rate of 4%. Given the benefits associated with network effects, which magni- tude grows parallel to the extension of the high-speed network, this threshold could be significantly reduced in subsequent projects.
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