Cargo is a subtheme of the City theme introduced in 2008. The theme consists mainly of vehicles used to transport cargo and mail, with several sets for each having been released. It reintroduced in 2013 and the sets are divided between those that are post office orientated and cargo orientated.
The LEGO City theme is based on city life with the sets depicting city and emergency services, police, fire, airport, train, construction, and civilian services. The City theme proceeded LEGO Town which was replaced with LEGO World City in before it was rebranded as City in 2005.