[Machine Translation] This is the fourth in a series of articles introducing train yards, the hubs of the railroads that are active on a daily basis. Focusing on the rolling stock depots of Seibu Railway's Ikebukuro Line system, which covers all of Saitama Prefecture. We take a behind-the-scenes look at the rail yards that support mass transportation, including Seibu's largest rail yard in Kotesashi and the Yokoze rail yard, where many railcars are preserved.