The term "railroad truck" refers to the wheels and suspension system that support railroad cars, allowing them to travel smoothly along the tracks. Other synonyms for this term include bogie, dolly, carriage, and truck assembly. In the United States, the term "railroad truck" is typically used to describe the entire assembly, including the wheels and axles. In other countries, however, the term may refer specifically to the truck bed or frame. Whatever the language and geography involved, railroad trucks are essential for the safe and efficient transportation of goods and passengers along the world's railroads.