On 18th, I photographed Seibu 6000 Series 6157F having yellow-coloured livery looking like 2000 Series and 9000 Series to celebrate 100th anniversary of Seibu Ikebukuro Line.
6157F, converted its adjustable voltage and frequency control equipment from gate turnoff thyristor made by HITACHI to insulated gate bipolar transistor made by TOSHIBA, and its motors from squirrel-cage rotor to permanent magnetic synchronous motor, came back to the regular operation a few days ago. I was little surprised at it that the carriage having passed not so many days since its coming back was chosen to put a event livery.
Before that day I have seen several processed photographs of Seibu 6000 Series made by railfans if it were coloured yellow, this kind of carriage comes true. Though the imaginary ones in those photographs are also painted in yellow around the front glasses, the real one is black like the front of 2000 Series and 9000 Series.
参考:通常のグレー塗装・ライオンズブルー帯の6157F 6157F in the regular season gray and blue line