A DC can motor, for sure. Also, FYI, these were built by Ajin of Korea.
May need a Mini-Commander; but these are old (by electronics standards) locos with what I assume is a relatively large reversing unit, so there should be room for ERR cruise.
Sound? Not so much, I'm thinking. Too bad, as these already have a 4-lobe axle cam and micro-switch for the ROW B&O brass "sound boxcar" that was offered back when.
You could add a small tender for sound; many tank locos had tenders added at various times in their lives. Not sure that the prototype tank loco for this model did.
The antenna on this all-brass model? I have no idea (maybe see tender idea, above).
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I have one; runs really well; proper gearing. I'd love to put ERR in it, but I'm getting less and less productive.