In Havana, urban transportation used to be provided by a colorful selection of buses imported from the Soviet Union or Canada. Many of these vehicles were second hand, such as the 1500 decommissioned Dutch buses that the Netherlands donated to Cuba in the mid-1990s as well as GM fishbowl buses from Montreal. Despite the United States trade embargo, American-style yellow school buses (imported second-hand from Canada) are also increasingly common sights. Since 2008, service on seven key lines in and out of the city is provided by Chinese Zhengzhou Yutong Buses. These replaced the famous camellos ("camels" or "dromedaries", after their "humps") trailer buses that hauled as many as two hundred passengers in a passenger-carrying trailer.

After the upgrading of Seville's public bus fleet to CNG-powered vehicles, many of the decommissioned ones were donated to the city of Havana. These bright orange buses still display the name of Transportes Urbanos de Sevilla, S.A.M., their former owner, and Seville's coat of arms as a sign of gratitude.[7]

In recent years (2016), urban transport in Havana consists entirely of modern Yutong diesel buses. Seville and Ikarus buses are gone.[8]

https://en.m.wikipedia.org/wiki/Transport_in_Cuba#Urban_buses