This is the kit for converting it to a rail vehicle. I've checked a dozen eastern European shops with no luck. It seemed that much of what Plus makes (made?) is not currently available. I don't know if this means that the item is retired, or they only produce periodic small batches.

It seems unlikely that anyone would have this, and even more unlikely that they would be willing to sell it if they did have it, but thought I'd try. If I can't find it, I'll just do my own crude (non-proto) conversion. In that case, I might even try to motorize it.

Charles

It's available here:
MODELCHOICE.net