Hi,
I was looking over my 1901 ORER of the D&RG. I first noticed that there are no reported car numbers for the 14 snow plows and flangers.
The box cars in the 2000-4999 range total 1763 and come in 8, 10, and 20 ton sizes.
The stock cars in the 5000-5999 are also in 8 and 10 ton sizes.
The flat cars come in four different sizes. The larges group (6500-7499) are the 8-10 size (486 total). The 15 ton class has 55 and the 20 ton has 81 members.
The coal cars (gons) also have 8,10,15 and 20 tin sizes.
As I recall, the 3000-3749 series box cars were rebuilt in 1903-4 and ended up with a capacity of 25 tons.