Microsoft Train Simulator 2 (abbreviated as MSTS 2) was a train simulation game in development by Microsoft Game Studios on two occasions. Meant to be the successor to "Microsoft Train Simulator", it was originally announced in 2003, until being cancelled in 2004. The second attempt at the game was first announced on , and originally scheduled for release in the last quarter of 2009. It was postponed indefinitely and virtually cancelled due to the closure of Aces Game Studio in 2009.