A raft is a flat vessel made of logs or planks used for water transport. Reed boats were made of grasses and were small and agile. Chinese junks were large sailing ships and an Arab dhow is an old sailing vessel with triangular sails. A wagon is a covered vehicle with four wheels to transport goods pulled by oxen or horses using harnesses. A coach is a four-wheeled vehicle pulled by horses for transporting people. A locomotive, also called an engine, is a wheeled vehicle with an engine that pulls trains along railway tracks.