This is a MicroTrains 4800110 N Scale Milwaukee Road 50' Gondola #81040. This 50' gondola with straight sides and drop ends is painted yellow with black lettering. 195 gondolas were built and delivered in the mid-1960s. They were numbered into series 81000-81194 and were delivered with steel floors and lading tie anchors. They were serviced and repainted in mid-1970s.