Here is some data I gleaned from D&RGW reports and a comparison with the RGS for the earlier time period. Hope this helps.
Rod
Car loadings
Farmington Branch
Cattle & Calves, SD
31 (1941)
3 (1948)
Sheep & Goats, SD
7 (1941)
3 (1948)
Sheep & Goats, DD
249 (1941)
98 (1948)
Silverton Branch
Cattle & Calves, SD
- (1941)
6 (1948)
Sheep & Goats, SD
8 (1941)
25 (1948)
Sheep & Goats, DD
114 (1941)
42 (1948)
Antonito - Durango
Cattle & Calves, SD
342 (1941)
546 (1948)
Sheep & Goats, SD
85 (1941)
75 (1948)
Sheep & Goats, DD
560 (1941)
483 (1948)
Rio Grande Southern
Cattle & Calves, SD
426 (1940)
Sheep & Goats, SD
- (1940)
Sheep & Goats, DD
859 (1940)
Sources: D&RGW 1941-1948 Narrow Gauge Report (available from the CRRM) & 1940 ICC Report on the RGS