This car appears to share tooling with Pemco’s 50-foot double plug door boxcar offering. Pemco examples do carry the Pemco name on the underframe and Hong Kong for their origin marks. The AHM examples are known to have CTC Hong Kong as origin marks on the underframe. AHM appears to have had this car first in the late 1970s and only offered two road names: Conrail and Railbox. You’ll find the box inaccurately identified this model as being 6o-foot.