Here's a paper model of a chemical container train car I've used as a prop in my Savage Cyberworld -campaign. Print it on two A4/Letter sheets, on cardstock, 120g paper or something else strudier than standard paper. I haven't added instructions as the model is quite simple, and I didn't see it necessary to add the parts that attach train cars to each other (whatever they are called in English), model worked quite well without them.