Yasumasa Takehara(Mr.) Assistant Manager, East Japan Railway Company Yasumasa Takehara is an expert in power supply for railway system and currently serves as Assistant Manager at East Japan Railway Company. Takehara holds a Master of Engineering degree. He has 19 years experiences in power supply field, and worked as maintenance manager, construction designer, power dispatcher and so on. Lately, he has conducted to the international railway project in Asian countries as a power supply expert.