Heavyweight cars, as illustrated by Dover Cliffs above, can be considered any car built of steel between the Pennsylvania Railroad's first all steel car of 1907 and the advent of Lightweight cars in the 1930's. Many rode on six wheel trucks. Railroad owned cars such as coaches and combines are a varried lot. My knowledge of these types is concentrated on the Pennsylvania Railroad.
As for Pullman sleepers, they were built in a variety of car types. The most common was a 12 Section 1 Drawing Room car. The so called 12-1. A section is a pair of seats in day time and an upper and lower berth at night. It was considered an accomodation for two people. The person in the forward facing seat got the lower berth at night, and the person riding backwards got the lower priced upper berth. I think there is an Abbot and Costello routine about upppers being lower than lowers. Sections can often be assesed from the outside by the regular placement of paired windows. These are two windows seperated by a narrow pilaster, and then a larger space between this pair and the next set. If you count six of these in a group on one a side of the car it probably has 12 sections. Of course Pullman use standardized construction methods, so this same window was used in other applications. This is a benefit to those of us who want to construct different body types because we can use these paired windows to represent other accommodations.
As for Pullman sleepers, they were built in a variety of car types. The most common was a 12 Section 1 Drawing Room car. The so called 12-1. A section is a pair of seats in day time and an upper and lower berth at night. It was considered an accomodation for two people. The person in the forward facing seat got the lower berth at night, and the person riding backwards got the lower priced upper berth. I think there is an Abbot and Costello routine about upppers being lower than lowers. Sections can often be assesed from the outside by the regular placement of paired windows. These are two windows seperated by a narrow pilaster, and then a larger space between this pair and the next set. If you count six of these in a group on one a side of the car it probably has 12 sections. Of course Pullman use standardized construction methods, so this same window was used in other applications. This is a benefit to those of us who want to construct different body types because we can use these paired windows to represent other accommodations.