Isle of the Kakapo has rolled out RailModeller Express 5.0, an update of the free model railroad and slot car layout design solution for Mac OS X.

It sports design tools that enable hobbyists to design model train and slot car track layouts via drag and drop. The app includes a library of parts covering over 200 track systems, allowing for custom designs of almost any layout a user can visualize. Layouts can be printed out, in sizes ranging from one page to full size.

RailModeller Express 3.0 requires Mac OS X 10.8 or later. It’s available at the Mac App Store (http://tinyurl.com/prmy7pu) in the Graphics and Design category. As mentioned, it’s free. However, there’s a $34.99 version (RailModeller Pro 5.0.12) that expands the number of track elements that can be used per layout, as well as the number of layers supported, and offers unlimited layout size.