Tomy's Super Rail system featured a variety of different short freight cars that were common on Japan's National Railways of the 1970s when most were first developed and used for years afterwards.
A WHAM 80000 box car with opening doors was one of the first freight cars from 1972. The doors on both sides open. Early examples have no stickers, but 80000 series stickers were added in the Super Rail Black era.
It was released in several sets in brown as well as later individually and in some sets in white and green as well.
Like other two-axle rolling stock, a spring underneath holds the couplings in tension and allows the coupling gimmick to work. It was also released in black with stickers in the five-car freight car pack. The earlier coupling hooks are clipped onto an axle molded into the rotating catch, but later hooks have the axle molded into their base and clip into holes in the receptacle.
First released in a dark blue color in one of the initial D-51 sets and later in white and yellow with Shell mark was a TAKI 45000-type tanker.
Released first in the initial EF-66 freight set in 1979 was this cream HOKI 2200 series hopper car.