A train simulator is a computer based reproduction of rail transport operations. REF file format is linked to the Microsoft Train Simulator Reference File, utilized by Train Simulator program; is also known as MSTS and it is a computer based game that engaged simulation of train operations. The game player or the user is able to operate a train that will run in 6 railway routes. The base package has 9 drivable locomotives and multiple units plus 8 AI trains. It also features custom building route in Europe, Asia and the United States. The Microsoft Train Simulator software can be utilized in Microsoft Windows based systems to access and play REF files. Usually REF files are categorized as data files containing shape file settings references such as the .S shape filename, class, alignment, shadow properties, and description, also, these files also are stored a list of shapes that can be imported into a simulation.