Double-stack cars are used to carry two levels of intermodal containers.
Unlike flat cars, double-stack cars have a well, or depression, that allows for higher loads. Some cars are fitted to carry trailers.
Double-Stack Cars
Railfanning Review Podcast
Before you copy and paste this information to your website, please keep in mind this research took a lot of effort. Appreciate it. Learn from it. But do not plagiarize it. Yes, if you think we might be talking to you, we are.