Buses and trolleybuses are the most popular public transport in major cities in North Korea. In general, they are Hungary’s Ikarus brand cars, which have remained since the USSR. At the same time, trolleybuses were extremely unhealthy due to deterioration of the communication network and the buses needed expensive diesel fuel. Nevertheless, transport workers in one of the port city of Namib city have solved these problems with renewable energy sources.
 
They placed 32 solar panels on the roof of each car having 100 watts connected to the fifty capacitors. In turn, the capacitors are powered by only 95 kilograms of compact electric motors. Depending on the size of the car, these vehicles can carry from 70 to 140 people at a speed of up to 40 km/h.
 
It is worth mentioning that at one time this idea was also posed by Indian engineers who developed wagons placed on roofs where solar panels were installed. According to the theory, they should cover 15% of the electricity needs of the train, at least in the first phase. At the same time, the battery produced by the train will be released to the national network.