The study is devoted to the economic evaluation of the Nairobi – Mombasa Standard Gauge Railway Project in Kenya. The cost-benefit analysis method was used to evaluate this project, the purpose of which is to find the net social benefit by subtracting all the project costs from the total social benefits. Among the various cost analysis methods, the corridor analysis method was used, as well as the empirical method, which included mathematical calculation, analysis and comparison of information from different modes of transport operating between the two cities of Nairobi and Mombasa, obtained from different secondary sources in order to obtain the social present value. There is a social benefit of $ 75 million and thus the project was worth the investment. The analysis of the Nairobi – Mombasa Standard Gauge Railway Project will help reduce the negative reaction that the Kenyan government has faced from local residents for its huge investment in this project, proving that the project is economically beneficial and will have a positive impact on the social welfare of the residents.