I'm basically just getting started here, but having a background in computers, I understand what's going on with DCC and it's very cool I must say. I've already decided on Digitrax as my system of choice, mainly because of their network architecture and transponding features. However, from what I understand about transponding, you need Digitrax decoders to make use of it. So what I'm looking for is some information about installing Digitrax decoders in engines, since I'm working in HO scale. Now I know Atlas is highly regarded with their engine quality, and some of their trains come equipped with decoders already, but others are simple "DCC-ready". This means they're ready to have a decoder installed but they don't have one yet, correct? I've read that there is kind of standard "slot" in some of these DCC ready engines that allows you to take a compatible decoder and simply drop it in the slot, kind of like installing a CPU in the motherboard socket. Basically, what I'm looking for is information about what to look for when examining engines and how this supposed slot installation works. It sounds like the easiest way to go, easier than doing a wired installation anyway. Is there a particular slot I should look for on an engine, and then look for decoders that match that slot that can be dropped into place easily? It's also possible I could be totally misinformed about this too. Thanks in advance, any help is greatly appreciated!