The bright yellow train car lets everyone know it is a Seibu line train, though in the past, that wasn’t always something they wanted to draw attention to. Seibu was one of the companies contracted to transport “night soil” (human waste) from Tokyo to rural disposal sites for several years after WW2, not exactly a highlight in current Seibu marketing plans. Today, the Seibu Ikebukuro line serves the western Tokyo suburbs from Ikebukuro into the heavily populated Nerima-ku and out into the foothills of Saitama. The “New Red Arrow” special express delivers passengers to the scenic mountain town of Chichibu in under an hour.