Microsoft Train Simulator 2 (MSTS 2) was a train simulator developed by Microsoft Game Studios until it was postponed indefinitely due to the closure of ACES Studios. MSTS 2 was first announced on January 19, 2007 and originally scheduled for release in the last quarter of 2009. The program's lead designer, Rick Selby, also announced in late 2008 that it was to be compatible with Windows XP, Windows Vista and Windows 7. It was to be the successor to Microsoft Train Simulator and was being developed by Aces Studio (Microsoft Game Studios), known for their long line of Microsoft Flight Simulator games, as a part of the "Games for Windows" initiative. The simulation was to use a modified version of the Flight Simulator X software platform. However, with the closure of Microsoft's Aces Studio