The 50-foot Plug Door Box Car is a common car type found in many HO-scale train lines. Reviewing the examples AHM offered over the years shows variations. A group of releases from 1979-1980 show AHM example's tooling is the same as one found in some Bachmann releases. AHM's 1979 Christmas Car and the cars carrying the 12000-series numbering all feature squared stirrup steps and other details that mirror examples found in Bachmann's releases. The mentioned holiday car and the 12000-series cars were made in Taiwan for AHM by what I believe was a Kader plant that operated in that country until the late 1980s. AHM's promotional Hood, Keebler, red roof Kellogg's Frosted Flakes, and Woolworth cars all share a similar design. These cars are Austrian made by Roco from what I've discovered. Note however a variation, the red roof Kellogg's Frosted Flakes has no slots in the shell along the sill for the underframe to snap in place. Though a very common car in many lines, I do not know of a general release for the Austrian-made 50-foot Plug Door in AHM's line. The car was only found in promotional sets. I have seen a blue Chessie System example of this car, but it was a Charmerz release. I don't know of any railroad roadnames issued under AHM's name for the Austrian 50-foot Plug.