The purpose of this project was to develop the preliminary design of a public transportation system (PTS) that would support a theme park. Disney's America, a theme park originally planned for Northern Virginia, was used as the basis for this project. The problem was that the primary interstate that serves the park site was already overcrowded; this project was intended to expand the realm of possible transportation solutions to include public-transit solutions. The following report identifies five feasible transit mode alternatives for the PTS. It shows calculations that were performed to determine various aspects of each transit system design, including headway, operating time, cycle time, number of vehicles, total number of vehicles required, and frequency of service. This report also describes evaluation criteria that were used in the decision making process. It presents the results of a life-cycle cost analysis that was performed as part of the evaluation of alternatives. From the alternative systems that were considered, the bus transit system was selected for the PTS. / Master of Science