ective project selection methods in case of if this paper might be one of a number of proposed projects to be considered by Cho-Karnchang company.
             Metropolitan Rapid Transmit: MRT is the integrated mass transit railway transportation in area particularly within Bangkok, which is the capital city of Thailand, and also suburb nearby Bangkok. The project initiating plan has been developed since 1992 by the Thai Government to follow the development of transportation system in some industrial countries. With the distance covered 487 kilometers and expected budget approximately more than 10 billion US dollars, the mass transit railway network has become the mega project establishing by the Government ambition. Furthermore, the Skytrain, which is Bangkok's first contemporary mass transit railway network, was officially operated on 5 December 1999. It comprises of 23 stations and 2 lines with a linkage line distance of 23 kilometers. After that, on 3 July 2004, the underground mass transit railway line comprising of 21 kilometers and 18 stations was opened and is serviced by 19 car trains as same as the Skytrain. On the other hand, the Government has currently planned to expand these MRT mass transit network links for future transportation. Therefore, the national budget has been annually provided to subsidize the project aimed to accomplish this mega-project successfully. There are totally 9 mass transit railway network lines in a draft plan as a spider web shown in Figure 1
             Figure 1: The Draft Plan of Nine Line Mass Transit Railway Networks
             The ministry of Transportation, as a responsible section assigned by the Thai Government, has involved with project plan for decades. Resources and processes have been organised deliberately with the hope of better transportation system in crowded people city.
             The nine mass transit railway linked system could be identified by the difference of color. Each color represents the line between origina...