To be more specific, I'm asking about the "snap-fit" track mentioned with some Williams starter sets like this one <http://www.bachmanntrains.com/home-usa/products.php?act=viewProd&productId=3304>

It does indeed look like Atlas Industrial Rail. If this is the case, there is an O transition piece available. Thank you very much.

What exactly is the O gauge "snap-fit" track included with some starter sets?

What track systems are compatible with it? Is there an adaptor section of track of available?

Where can more of it be purchased? What other track parts are available?

Thank you.