The "Converter" was a playset which was a direct relative of the late battery powered "Lima Crick" trains in the early 1990's. It used the well known HO plastic track. The "train" was sort of a railcar, which could be assembled from different modules to look like a space ship/aeroplane, a railcar or a bus or anything in between. I believe that there were at least 2 different converters available.