With see-through roof walks, grab irons, and other separately added parts, this model is a detailed replica of the Pullman-Standard PS-1 boxcar. Pullman had been making freight cars for more than half a century when it hit a home run with the PS-1. Introduced in 1947, it set the standard for postwar American freight cars. What made the PS-1 a landmark was its welded construction - an area in which Pullman led the industry. In addition to lighter weight, welding offered superior strength and better resistance to weather and corrosion than contemporary riveted cars.