What type of cars are described as "cars" in the context of a train?

In the context of a train, the term "cars" is most broadly described by the term "railroad cars." This encompasses all types of cars used on trains, including passenger cars, freight cars, and specific types of freight cars such as box cars. The broader label "railroad cars" recognizes that "cars" can refer to various functional designs and purposes, reflecting the diversity of rolling stock used in rail transport.

Passenger cars are specifically designed for carrying individuals, while freight cars are utilized for transporting goods. Box cars are a type of freight car designed to carry bulk freight securely. By using the term "railroad cars," it captures the entire spectrum of vehicles operated within the rail system, making it the most accurate representation of what "cars" means in this specific context.