J-Through cards can be used only at the stations between Yamashina Station and Omi-Maiko Station (J-Through cards can't be used at the stations between Kita-Komatsu Station and Omi-Shiotsu Station).
また、山科～近江舞子間の各駅のみJスルーが利用できる（北小松～近江塩津間での利用はできない）。