QSI, TMCC (Railsounds 1,2,3,4,5), Odyssey, Proto 1, 2, in a few years will no longer be supported with spare parts. UPGRADE and save yourself the aggravation of having a shelf queen when the older electronics fail and no one makes the boards, or worse no one wants to run anything that isn't dcc, blue tooth, or whatever is latest and greatest.
I remember in the 80s QSI was the "newest" technology and a ZW the best way to run it.
Now you can use a cell phone (Not a common household device back then) and several different mfgs transformers.