CMO 10000 is a 5200 cubic foot covered hopper with a load limit of 221,600 lbs, tare 64,400 lbs
GACX 186 is a 5660 cubic foot covered hopper with a load limit of 219500 lbs, tare 66500.
Both of these are food grade cars for bulk grains and flour.
The BO ("B&O") car is really rough - I can't read the number well at all. It's probably old enough that it's been repainted and re-stenciled as a CSX car. Looks like it might have been hauling dry chemical. Maybe cement, but it's awfully large for that service.