@rplst8 posted:Probably because they discontinued the CAB-2 and Legacy Base.
That could be true. If you search for this on Lionel.com. They stopped giving the catalog year. So, I do not know how old it is. It is using the new number system but that has been going on for several years. It runs fine and I don't really know what the memory module inputs to the Legacy system other than name, number, sound system, operating mode, etc.
It is more a curiousity issue. I have 20+ modules and thought it odd not to have one for this engine. Maybe the seller didn't include it.