Busan, South Korea's largest southern port city, has become the country's first city to have smart rail cars on its subway system, the rail cars' manufacturer said Friday.
The smart rail cars control lighting, air quality and the volume of broadcasts by themselves depending on conditions in and outside the cars, Hyundai Rotem Co. said in a statement.
Hyundai Rotem's smart rail cars are added to a subway train in Busan, the country's largest southern port city. (Hyundai Rotem)
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