Very good. If a car has plastic trucks, the single best thing to do as a first step is to replace them with diecast sprung ones. Your added detail on the steps, and warning placards, are nice as well.
There was another thread a few days ago, talking about these and other tankers. As was discussed there, these Lionel tankers are fully scale-sized 8000 gal. tankers, and are well enough detailed to fit right in with scale trains as well as traditional ones. These Lionel tank cars are an interesting and colorful group of cars. I have about 20 of them in my collection - always liked them.