Anyone know a way to create with a software duplo train track layout?
The only thing I found is: http://www.anyrail.com/index_en.html
It's a bit overkill for what I need and it's $US60, although the limited version can be used free.
Lego has a track planner for non-duplo track. http://www.lego.com/en-us/city/trains/track-planner
If I can't find something, I'll probably try to do it myself (I have a background of tools programmer in video game industry)