When the aspect of the signal (the 1st home signal) in the Yamashina Station, which is located ahead the first block signal, is 'stop' (the red light is on), the aspect of the first block signal indicates 'speed restriction' (yellow + yellow) are lit).
その先にある山科駅の信号機（第1日本の鉄道信号機場内信号機）が停止を現示（赤を点灯）しているとき、この第1閉塞信号機は警戒を現示（橙黄+橙黄を点灯）している。