Although four local trains each hour are operated between Kyoto Station and Yamato-Saidaiji Station, they don't run at the 15-minute interval because their schedules need to be adjusted in relation with the trains operating on the Kyoto Municipal Subway Line.
ただし、京都～大和西大寺間の普通は毎時4本とはいえ、京都市営地下鉄電車とのダイヤ調整のため15分間隔ではない。