This simplified version of the Minitrix/Roco 50' covered gondola was part of the "Red Ball Express" toy trainset marketed by Aurora Toys crica 1977. I've never actually owned the set (or the car), but I'm told at least some of the pieces are stamped "Mexico". Anyway, it's plastic toy junk and not suited for use on a Model Railroad.
Here's the "locomotive" from the set -
