 The line runs on the left-hand side of the track, as opposed to the right-hand side of the track like all other Seoul Metropolitan Subway lines (another exception to this is Seoul Subway Line 4 although it runs on the right-hand side until Namtaeryeong station, and operates on the left-hand side for the parts afterwards) since railways in Korea generally run on the left side.Korail operates a variety of express "rapid" (급행, 急行) trains for long distance commuter services on Line 1.These services include