haha
Maybe some ammo? A few Panzer IV rounds (boxed, loose)
You don't have to go for the figure(s), but I think you can figure something out- maybe extend the loose items on the platform to the train to connect the two? -like maybe crate ammo on the platform and loose ammo on the train
I'm sure you could throw around some maintenance tools and other odds and ends, maybe someone with more WWII German logistics knowledge can chime in