The coal-fired gas turbine system definition and economic assessments are based on the Coal Burning Locomotive Study previously conducted by the GE Transportation Systems Business Operations with Burlington Northern and Norfolk Southern railroad sponsorship, and later with additional funding from the United States Department of Energy. The objectives of that study were to validate the feasibility of locomotive designs using coal as a fuel substitute for diesel oil. The objective of this report is to provide a preliminary definition of a coal fueled gas turbine locomotive system and a preliminary assessment of the system technical merits and economic boundaries. The system definition will be used to guide the technology development efforts in the Advanced Coal Fueled Gas Turbine System Program. The overall program objective is to develop the technological basis necessary for subsequent commercial development of direct coal fueled gas turbine power systems. The system definition will be updated as the technological bases mature through program component development and integrated system testing.