Beginning in the 1960ís, covered hoppers replaced 40' boxcars in grain service. First built in 1962, the Pullman Standard 4427 cubic foot low-side covered hopper is one of the legendary cars that helped make this transition successful. Graced with many colorful paint schemes and plying the rails throughout North America, these cars carried numerous dry commodities including grain, corn, wheat, flour and many other forms of dry bulks.
Pullman substantially redesigned the 4427 in 1966, raising the side sills to reveal more of the hoppers, and adding two more ribs, eliminating the two wide panels. This later version (the basis for the Micro-Trains model) remained in production through 1971.