Track layout sims

As a model railroader i frequently spend a lot of time laying out track plans for new layouts (About twice a year) Are there any free online track layout simulator/ design sites where i can compose various layouts before making them for real?
Thanks

I know of two free programs, one more simple and the other more complex.

1. Simpler: Anyrail at http://www.anyrail.com/index_en.html
2. More complex: XtrkCad at http://sourceforge.net/projects/xtrkcad-fork/

Good luck!
-Al

You can try bahn as well

http://www.jbss.de/hpg_eng.htm