I know Marklin isn't the biggest make on this group but I'm hoping somebody will be able to point me to some good reference on the various generations of digital technology they've iterated over and their respecive cross-compatibility.
What I mean is, if I have (say) an old Delta controller and a new mfx loco, is the "run" and "reverse" encoding from the Delta controller compatible with the loco? I know (from reading the specs I've found) that the reverse is true; a "beter" controller can always handle an older train and (obviously) the Delta controller can't handle any of the fancier functions on the mfx loco.
Reason for asking? There are a lot of various offerings on the used Marklin market around here and while I'm not planning any move to digital right now, my purchases might be influenced by which parts can work (well) together in the potential future.