We have considered two relevant modeling tools for transport calculations and cost-benefit analysis of new lines for high speed trains between Stockholm and Gothenburg and Malmö, respectively. Sampers is liable to calculate the long-term consequences on the transport demand and the geographic distribution of this by changes in the population's composition, size and location, economic development, and transportation system's development. Samvips allows for more detailed and realistic modeling of public transport supply and thus the demand for traveling with the various lines, but lack calculations of the overall transport demand and how supply impacts total demand. Samvips will be a better suited tool to study options for the market's request for development as result of the investment. Sampers can then be used to generate overall transport demand to Samvips. The cost-benefit calculation show strong unprofitability for the project. It gives significant benefits for transportation users, operators and third party. The investment cost is considered realistic, but more than twice as large as the benefit. Supplementary analysis, sensitivity analyses and our reviews do not indicate that the project is socio-economic profitable.