Zek and I and old steam locos.

Problems with Steam locos the 4-4-2, 2-8-0, and 4-4-0 do not work for Zek. He had them but had no sound do to him not having the Black Five. I sent him the audio and all and now with the audio there the locomotives don't show up. if he takes it back out then they show up again. We have checked the paths and they appear to be the same. Mine work OK.
His tenders show up but not the locos with this problem. Anyone have any idea what the problem is?
His tenders show up but not the locos with this problem. Anyone have any idea what the problem is?