The blocking system was, however, not suitable to assure smooth operation of one Special Rapid train, one Rapid train and two local trains every fifteen minutes in a cycle, which meant each train was running at intervals of an average of three minutes and forty-five seconds.
15分サイクルに新快速・快速・緩行2本が走るという事は平均3分45秒間隔で電車が走る事になるが、その運転間隔をスムーズに運転するだけの閉塞割りでは無かった。