Railfan Technology > Software Database for rail travel routes?

Are there any commercially available map software programs, or hosted groups, where one can map out rail routes [or segments of rail routes] traveled?
I'm looking for a computerized version of hi-liting rail routes on an atlas, if something like this exists; thanks. 

To answer my own question: travelmapping.net has added a separate database to map out completed rail travels.  It is an all-volunteer work-in-progress; so far they have included all of the Amtrak routes and most US-based commuter lines and transit lines.  They have *some* tourist/heritage lines, and they even included rail-like shuttles that exist in airports (such as Denver and Orlando).  Overseas routes are limited; several countries have commuter/light rail lines included, but main lines have not yet been added.  It's a start.