OpenRails

Our goal is to enhance the railroad simulation hobby through a community designed and supported platform built to serve as a lasting foundation for an accurate and immersive simulation experience.

By making the source code of the platform accessible to community members, we ensure that Open Rails will continually evolve to meet the technical, operational, graphical, and content building needs of the community. Open architecture ensures that our often considerable investment in building accurate representations of routes and rolling stock will not become obsolete due to 'economic realities'.
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Latest Version Available(v0.6.2)
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Download
http://www.openrails.org/release.html