From then until 1924 all box cars were built to this design. However, over the years many improvements were made both in new cars and upgrades of older cars. All later designs had single doors.
Several photos show the car with slighly different details on the left and right sides.
We don't know if the differences were contemporary or sequential but strongly suspect the former. Therefore, the two sides on the model are different. All photos show the car in Roman lettering. However, we know that other similar cars were given Gothic lettering in the 1950's. We have included both Roman and Gothic lettering in the decal set.