When the Kosei Line was opened, the local train would run only once an hour between Kyoto Station and Omi-Imazu Station or Nagahara Station; however, with the increase in the residential housing along the line the number of local trains has gradually increased.
開業当初、普通列車が京都～近江今津または永原間で1時間あたり1本というわずかな運転本数であったが、その後沿線の住宅増加に伴い、普通電車の本数は徐々に増加している。