This is the HO Scale AAR 40' Single-Door Steel Boxcar - Kit - Undecorated from Accurail.
These easy-to-build HO Scale plastic car kits feature a one-piece body with details molded in place. Decorated models feature authentic paint and lettering schemes with end reporting marks. In addition, the trucks feature nonmagnetic axles, and the coupler pockets accepts Kadee(R) No. 5 couplers.