These colorful farm trucks, called rot i-taen, date back as far as the fifties and are a very common sight in rural Thailand. Because of the distinctive sound they make, they are also referred to as tuktuk, not to be confused with the three-wheeled urban alternative to a taxi. Powered by single-cylinder diesel engines, that produce about 9 HP, they are rather slow, but are able to haul heavy loads. Their multi-functionality is not limited to transportation: their engines are easily removed so they can power ploughs and water pumps. An illustrating video underneath.