Train Simulator (originally RailWorks) is a train simulation game developed by Dovetail Games. It is the successor to Rail Simulator, and was released online on 12 June 2009 and in stores on 3 July 2009. The first release of RailWorks contained all five real-world routes of the original European and North American releases of Rail Simulator, and added three new fictional routes: Hedborough North, a large UK goods yard, Seebergbahn, a route set in the Alpine region and Castle Rock Railroad, a route based around Denver, Colorado.