Here is a Lionel-compatible O27 gauge three rail gondola for you to run with your military trains. The neat thing about gondolas is you can put all kinds of cool stuff in them.
Menards has released a series of military O cars. This one is out of production, is from 2019 and has the number 6674 on the side. There are others out there with different numbers, some more recently available. But this particular one is out of production. Build a long train of these and fill them up with toy soldiers, naval equipment, tanks, scrap, ammo, you name it.
CONDITION: C-8 like new.