So for the SP GP9 Freight Consist I made, it's a 61 Car + 1 Caboose Consist, hauled by three GP9s. It consists of the following from various content creators from remember correctly:
50ft Gondolas
50ft Reefers
60ft Boxcars
60ft Waffle P-S ACF Boxcars
60ft Gondolas
60ft HiCube Boxcars
86ft HyCube Boxcars
2Bay ACF Hoppers
Total Loaded Train weight is 3,375 US Tons.