To run the software contained within these archives, your PC typically needs to meet these SimRail/Simulator standards: : 64-bit Windows 7 SP1, 8.1, or 10.
: Major Game Update 3 introduced significant technical improvements, including AI behavior changes for track crossovers and signal management. Minimum System Requirements
While "Part 3" in a file name refers to file compression, "Part 3" in community content often refers to specific tutorials or scenarios: