Well my offerings for MoPac are very humble indeed, but I will post them here just for the fun of seeing them with all your beautiful scale items.
Here is the Marx #54099 MoPac operating cattle car from 1956-57. There is a mechanical trip under the car which when activated opens the door and pushes a cow partially out the exit.
Here is the Marx #800 GE 70 ton switcher and the matching Marx #1231 MoPac caboose.
Well that's about it for my MoPac equipment. Best wishes for a great new year!
Don