I saw Yokohama Minatomirai Railway Y500 Series changing its train kind and destination at Shakujii-koen Station on Seibu Ikebukuro Line.
Among the units for the train going through Tobu Tojo, Seibu Ikebukuro, Tokyo Metro Fukutoshin, Tokyu Toyoko, and Yokohama Minatomirai Railway Lines, Y500 Series is the only one with rolling kind indicators. The roll has something drawing the railfans to whom it shows various kinds while moving.