Thanks guys this helped a lot!!!

Can I used an engine I bought on eBay that has a digitrax decoder in it on my bachmann dynamics system?

I couldn't find anything on this topic so I am just going to put it out there for any help.
I bought a box of mixed Bachmann ez Track pieces off eBay and wanted to know how to tell the difference in the radius pieces? I want to design this layout I found using the ez track but I don't know how to find the difference in the radius's.