The Shinbundang Line or DX Line for Dynamic Express Line is a 33.4 km (20.8 mi) long line of the Seoul Metropolitan Subway. It is the world's fifth subway to run completely driverless and the second completely driverless metro line to open in South Korea, after Busan Subway Line 4. It connects Sinsa station and Gwanggyo station in 42 minutes, a feat achieved by being the first line to operate South Korea's next-generation subway car travelling at over 90 km/h (56 mph), with the fastest average speed of any subway line in the country.